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What is the difference between single-quoted and double-quoted strings in PHP?

Single or double quotes in PHP programming are used to define a string. But, there are lots of differences between these two. Single-quoted Strings: It is the easiest way to define a string. You can use it when you want the string to be exactly as it is written. All the escape sequences like \r or \n , will be output as specified instead of having any special meaning. Single-quote is usually faster in some cases. The special case is that if you to display a literal single-quote, escape it with a backslash (\) and if you want to display a backslash, you can escape it with another backslash (\\) . 

Below program illustrates the Single-quoted Strings:  

Program 1:  

Double-quoted strings: By using Double quotes the PHP code is forced to evaluate the whole string. The main difference between double quotes and single quotes is that by using double quotes, you can include variables directly within the string. It interprets the Escape sequences. Each variable will be replaced by its value. 

Below program illustrates the Double-quoted Strings:  

Program 2:  

Let us understand the differences in a tabular form -:

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Quoting String Constants

There are three ways to write a literal string in your program: using single quotes, double quotes, and the here document ( heredoc ) format derived from the Unix shell. These methods differ in whether they recognize special escape sequences that let you encode other characters or interpolate variables.

Variable Interpolation

When you define a string literal using double quotes or a heredoc, the string is subject to variable interpolation . Interpolation is the process of replacing variable names in the string with the values of those variables. There are two ways to interpolate variables into strings.

The simpler of the two ways is to put the variable name in a double-quoted string or heredoc:

The other way is to surround the variable being interpolated with curly braces. Using this syntax ensures the correct variable is interpolated. The classic use of curly braces is to disambiguate the variable name from surrounding text:

Without the curly braces, PHP would try to print the value of the $nth variable.

Unlike in some shell environments, in PHP strings are not repeatedly processed for interpolation. Instead, any interpolations in a double-quoted string are processed first and the result is used as the value of the string:

Single-Quoted Strings

Single-quoted strings do not interpolate variables. Thus, the variable name in the following string is not expanded because the string literal in which it occurs is single-quoted:

The only escape sequences that work in single-quoted strings are \' , which puts a single quote in a single-quoted string, and \\ , which puts a backslash in a single-quoted string. Any other occurrence of a backslash is interpreted simply as a backslash:

Double-Quoted Strings

Double-quoted strings interpolate variables and expand the many PHP escape sequences. Table 4-1 lists the escape sequences recognized by PHP in double-quoted strings.

Table 4-1. Escape sequences in double-quoted strings

If an unknown escape sequence (i.e., a backslash followed by a character that is not one of those in Table 4-1 ) is found in a double-quoted string literal, it is ignored (if you have the warning level E_NOTICE set, a warning is generated for such unknown escape sequences):

Here Documents

You can easily put multiline strings into your program with a heredoc, as follows:

The <<< identifier token tells the PHP parser that you’re writing a heredoc. There must be a space after the <<< and before the identifier. You get to pick the identifier. The next line starts the text being quoted by the heredoc, which continues until it reaches a line that consists of nothing but the identifier.

As a special case, you can put a semicolon after the terminating identifier to end the statement, as shown in the previous code. If you are using a heredoc in a more complex expression, you need to continue the expression on the next line, as shown here:

Single and double quotes in a heredoc are passed through:

Whitespace in a heredoc is also preserved:

The newline before the trailing terminator is removed, so these two assignments are identical:

If you want a newline to end your heredoc-quoted string, you’ll need to add an extra one yourself:

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4. string data type, single quoted strings in php, double quoted strings in php, heredoc strings in php, nowdoc strings in php.

Differentiate Single and Double Quotes in PHP

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Introduction to Single and Double Quotes in PHP

Differences between single quote and double quotes during the interpolation of string and variable in php, differences between single quote and double quotes while escaping apostrophe in php.

Differentiate Single and Double Quotes in PHP

This article will introduce the differences between single and double quotes in PHP.

In PHP, we use quotes to specify the value is a string literal. There are two different types of quotes. They are the single quote, ' and the double " quotes. However, we can specify the string literals using string syntaxes like herdoc and nowdoc . In this article, we will focus on the quotes. We can wrap the string literals with single or double quotes to represent the value as a string. An example is shown below.

Example Code:

In the example above, the use of both quotes seems to be the same. But that is not only the case. The function of the quotes are the same, but there is a difference in the way they work. We will discuss the significant differences between the single and double quotes below.

The most significant difference between the single and the double quotes lies when we interpolate the string and the variable. The single quote does not interpolate the string and the variables. The content inside the single quote prints out as exactly as it is. In most cases, there is no compilation of any variables or escape sequences inside the single quote.

But, in the case of the double quote, the variable written inside the quotes will be interpolated with the string. It means that the variable in the string will be evaluated. Consequently, it is easy to use double quotes when interpolating the string and the variables. The advantage of double quotes over single quotes is that we need not concatenate the string and the variables using the . operator. However, as the variables need to be evaluated in the string, using double quotes will be slightly slower than using the single quote.

For example, create a variable $name and write the string Bond to it. Next, write the string The name is $name. and enclose the string with double-quotes. Use the echo function to print the string. Similarly, enclose the exact string with a single quote in the following line.

As the output shows, the variable $name is evaluated using double quotes. While using the single quote, the string is printed the way it is. This is one of the significant differences between the single and double quotes in PHP.

This section will discuss the escape sequences using double quotes and single quotes in PHP. The escape sequences can be used inside the double quotes to escape the characters. Meanwhile, most escape sequences are not interpreted inside a single quote. However, there is an exception for escaping the apostrophe.

There is no need to escape the apostrophe if we write an apostrophe in the string while using double-quotes. But, in the case of a single quote, we need to escape it using \' . The example is shown below.

In the above code, it is obvious that the apostrophe must not escape using the double-quotes. The double quotes are also escaped inside the double quotes using the character escapes. Meanwhile, in the case of the single quote, the apostrophe is escaped using the character escape. In the latter case, the double quotes are not escaped while using the character escapes.

These are the significant differences between the single and double quotes in PHP.

Subodh Poudel avatar

Subodh is a proactive software engineer, specialized in fintech industry and a writer who loves to express his software development learnings and set of skills through blogs and articles.

  • Function Reference
  • Text Processing
  • String Functions

(PHP 4, PHP 5, PHP 7, PHP 8)

addslashes — Quote string with slashes

Description

  • single quote ( ' )
  • double quote ( " )
  • backslash ( \ )
  • NUL (the NUL byte)

A use case of addslashes() is escaping the aforementioned characters in a string that is to be evaluated by PHP: <?php $str = "O'Reilly?" ; eval( "echo '" . addslashes ( $str ) . "';" ); ?>

The addslashes() is sometimes incorrectly used to try to prevent SQL Injection . Instead, database-specific escaping functions and/or prepared statements should be used.

The string to be escaped.

Return Values

Returns the escaped string.

Example #1 An addslashes() example

  • stripcslashes() - Un-quote string quoted with addcslashes
  • stripslashes() - Un-quotes a quoted string
  • addcslashes() - Quote string with slashes in a C style
  • htmlspecialchars() - Convert special characters to HTML entities
  • quotemeta() - Quote meta characters
  • get_magic_quotes_gpc() - Gets the current configuration setting of magic_quotes_gpc

User Contributed Notes 19 notes

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sprintf

Combining String Literals And Variables In PHP

Volodymyr Umanets

In PHP we have several options for specifying strings, but most of us are only familiar with defining string literals using quotes. Sometimes, these strings are simple and we can use them as-is, but more often than not we need them to be dynamic, combined with different variables.

It’s important to have a good understanding of how you can combine string literals with any variable.

The most common approaches to adapt a string are to use:

  • Single quotes with concatenation,
  • Double quotes with in-string variable,
  • sprintf (vsprintf) function,
  • heredoc (newdoc) syntax.

We’re going to focus on each option, its strong and weak points. First, let’s dive into the theory.

-

#1 Single quotes with concatenation

A single-quoted string does not have variables within it interpreted. Unlike the other options, variables in a single-quoted string won’t be expanded when they occur. That means you need to use concatenation.

#2 Double quotes and in-string variable

With double quotes, the PHP compiler will expand every escaped variable inside a string literal.

#3 Sprintf (vsprintf) function

Sprintf is the most powerful and advanced PHP string formatting function, giving you so many options to control the final result. It lets you format strings according to a special templating language and seems to be a much more powerful way to insert variables into them, with the biggest processing time cost though.

The sprintf function takes the string template as its first argument. Following that, there can be an indefinite amount of arguments. Sprintf will replace placeholders inside a string according to the arguments that you passed to the function.

#4 Heredoc (and nowdoc)

A Here Document is defined as a section of a source code file that is treated as if it were a separate file.

Improved syntax (since PHP 7.3), makes us using heredoc in a more readable, much cleaner and less error-prone way. Heredoc lets you do something that’s harder to do with a quoted string literal. It lets you define a block of text as literal.

By default, PHP will process a heredoc like it would a double-quoted string literal, while nowdoc - a single quoted string. To use a nowdoc we just need to enclose the opening identifier in single quotes.

Heredoc syntax:

Newdoc syntax:

Let’s test each approach with a few examples.

Consider the following text:

We have to deal with a huge number of quotes, concatenation and extra spaces here.

#2 In-string variable

Looks much better, just remember to escape variables, and special characters (“ in this case).

Looks also pretty readable, with no escaping.

Alternatively, we can pass the variables as an array.

Same if we use the vsprintf function.

No escaping, no concatenations or extra quotes, no need to call functions, but 3 lines for a simple string. 

Let’s say we want to add some markup with dynamic variables:

We would recommend using heredoc here:

In-string looks similar, but we need a bit more escape characters ‘\’ and {}.

Concating looks less readable, but thanks to formatting it is not annoying. But that’s not the main problem here:

Imagine we want to add a new dynamic variable to <p> tag, in heredoc syntax:

or in double quoted :

While for a single quoted case we need to find the right place before adding more concatenations and quotes. It is very easy to make a mistake:

And what’s about sprintf :

Passing a multi-line string doesn’t look great, unless you want to assign it to some variable first. 

Also, remember to keep the number of variable placeholders low. Otherwise, you will have a maintenance nightmare with 10+ parameters, trying to add new %s, finding the position in the parameter list and add it to the sprintf call. 

In the above example, if we want to add a new variable

right after the line-height we need to figure out that it is the third parameter and list it as an argument between $size and $text1 . Doesn’t sound cool. In this case you can try playing with ordered placeholders like %1$s , %2$s , additionally that placeholders can be repeated without adding more arguments in the code.

Performance comparison

The initial setup for our test:

  • Number of iterations - 5.000.000
  • The simple case is Knock knock, $lang has you.
  • The complicated is Knock knock, "$lang" has you. Wake up $name, $action

The results:

string and variables chart

MYTH: Using “ is faster than ‘. PHP will not use additional processing to interpret what is inside the single quote, while inside double quotes PHP has to parse and check if there are any variables.

Today, the argument that one performs better than the other doesn’t hold any water, unless you start combining the string with variables, then the double-quotes method is definitely a winner here.

We find an in-string option the most usable method for combining the strings and variables. But general advice is to use each method for a certain scenario. 

Here are the recommendations for each approach:

  • Use single quotes by default unless you need to use variables within the string. Otherwise, you will get the maintenance mess, increasing with the complexity of strings, because you have to deal with a huge number of quotes, concatenation and extra spaces. The same happens with performance, the string with more concatenations is less efficient against the #2 and #3.
  • Double quoted strings are more elegant because you don't have to break up your string every time you need to insert a variable (like you must do with single quoted strings). As a result, it is easier to both write and read such strings. Also, it is one of the fastest approaches, especially in hard scenarios.
  • Heredoc acts like a double quoted string, which might be also the option for you. Both heredoc and nowdoc syntaxes are very useful when we want to define a multiline string. Performance is equal to #2.
  • The most flexible and powerful option is sprintf , but also the slowest one. You can use it, but for shorter strings, as it becomes pretty hard to use this solution after 4-5 variables. Remember, that you can do much more than just inserting variable values in strings, for example, specify number format (hex, decimal, octal), number of decimals, padding and many more.

At Droptica, we have been providing PHP development services for over 10 years. This text is the result of experience gained. So if you have a project that requires expert PHP knowledge, feel free to contact us.

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PHP single vs double quotes explained

by Nathan Sebhastian

Posted on Oct 04, 2022

Reading time: 1 minute

php variable string double quotes

PHP allows you to use either single or double quotes when defining a string.

But there’s a difference when you use single quotes instead of double.

The main difference is that strings in double quotes are processed (or evaluated) while single quote strings are treated as they are.

When using double quotes, you can put variables and escape sequences in the string as follows:

The output will be:

When you use single quotes, then you can’t put a string directly as shown below:

The output is as follows:

As you can see, both the variable and the escape sequences are interpreted as it is.

PHP doesn’t process any special characters in a string enclosed with single quotes.

When you use double quotes, you can also use curly braces ( {} ) to isolate the variable name for evaluation.

Suppose you want to join two variables using an underscore ( _ ). You can enclose the variables using curly braces as follows:

Without the curly braces, PHP will look for the $first_name_$last_name variable.

Aside from enclosing a variable, the curly braces also make the variables inside the string more standout. Sometimes you can mistake a variable for a regular string without the curly braces.

And now you’ve learned the differences between single and double quotes when defining a string. Good work! 👍

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Felice Forby

Posted on Oct 25, 2018

Double Quotes vs Single Quotes in PHP

This is an article I wrote a while ago on my old blog when I first started learning PHP. I'll repost it here, in case it helps anyone :)

If you want to save text as a variable or display it on the screen (with say, echo or print ), you have to surround the text in quotes. Surrounding text by quotes makes that text a string.

You can use either single quotes ( ' ' ) or double quotes( " " ), but there are some important differences, which I'll go over in this post.

Single Quotes

Single quotes are the simplest way to make a string. They just display what they are given, no bells and whistles, no special "powers" like being able to show variable values (see below in the Double Quotes section).

Line breaks with single quotes

If you need to display text on multiple lines, you can use line breaks within the quotes to achieve this. For example:

This will be output as:

If you try to use multiple  print or  echo  on multiple lines, it won't work the same way. For example:

Special characters and escape characters with single quotes

You only have two options when it comes to single quotes:

One:  \'  to escape a single quote within a single-quoted string

You would need to escape the  '  character if you want to include it in the string. For example:

This would properly output the following without causing an error.

Za'atar is a Middle Eastern spice mix.

Two: \\  to escape the backslash—the escape character—within the string

You could use

A \ is called a "backslash."

*It might depend on the compiler, but when I was testing this out,   \  seems to work by itself too. But, if for some reason you want to display  \\ , you might need to use something like echo '\\\';  or  echo '\\\\'; . Since it's a special character, it's probably best to escape it just in case.

Double Quotes

One big difference about double quotes vs single quotes is that you can use double quotes to include variables directly inside the string. If you use single quotes, you would have to concatenate the pieces together. Let's see an example.

Let's say you have recipes and you save the titles into a variable called $recipe_title :

If you want to create the HTML for recipe titles so that they look like this (and you aren't embedding PHP directly into HTML files, in which you might use <?php ?> tags instead to spit out variables):

Using single quotes you need to add the different parts together:

With double quotes, however, you can put the variable directly inside the quotes:

Both methods work just fine, but using double quotes can save you some hassle.

Use curly braces to explicitly specify the end of a variable name when parsing it into a double-quoted string.

Trying to print 2 cups on line 2 below will give you an error because the code thinks the variable name is $unit_cups instead of $unit_cup :

To avoid errors like this, you can surround the variable name in curly brackets likes so:

You can also do some more complex operations right in the double quotes, but that's beyond the scope of this article. To learn more about parsing complex operations within double quotes, check out the examples in the PHP manual .

By the way, like single quotes, you can add line breaks to your output by including line breaks within the string. For example,

Special characters and escape characters with double quotes

Double quotes give you many more special characters to work with than single quotes, including the line break character.

  • \n for a new line
  • \t for a tab
  • \r for a carriage return
  • \$ for a dollar sign (otherwise it could be mistaken as variable)
  • \" for a double quote
  • See more in the PHP Manual

What Should I Use?

In general, you use either or, but you should be consistent with what type you use and when. For example, you might choose to use single quotes by default unless you need to use variables or special characters within the string.

You might think that because double quotes give you more features, that it would be better to use them all the time, but single quotes are probably better for simple strings because you don't need to escape special characters like dollar signs.

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PHP String: Everything You Need To Know Before Getting Started

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String in php

It is the reason that we have created this guide to help you get started. Go through this article to gain clarity with PHP strings.

JUMP TO TOPIC

– What Is a PHP String?

– how to create a php string, – php string variable example with single quotes, – php string variable example with double quotes, – complex string example, note on complex strings, – newdoc syntax example, – note on newdoc syntax, – quotes in string example with single quotes, – quotes in string example with double quotes, – php string interpolation example, – “.” operator example, – alternative php to string example, final thoughts:, string in php: answering the what and how.

Before getting into the complexities, let’s start with the basics of PHP strings .

A string is a data type supported in PHP along with various other languages. It is a sequence of characters or simply a text that is wrapped in double or single quotes.

Here is an example:

You can specify a PHP string literal in four ways:

  • Single Quoted: You can add a string inside single quotes
  • Double Quoted: Wrapping the string inside double quotes
  • Heredoc Syntax: Starting the string with <<<Identifier and a newline while ending it with the same identifier and a semicolon
  • Nowdoc Syntax: Using the similar syntax as heredoc while quoting the starting identifier inside single quotes

PHP String Variable: Single Quotes vs Double Quotes:

Can’t decide between using single quotes and double quotes to create a PHP string ? No worries, we’ll tell you how to decide within seconds. But remember that, while coding, our top priority should be the performance of the overall program. So, here is how you can maintain it well:

It would be good to use a single-quoted string when you are dealing with a pure PHP string literal . This means that the string doesn’t have any escape sequences, variables, array, or object values to be evaluated. Instead, it is a simple string that doesn’t need to be parsed.

Refer to this code snippet for clarity:

On the other hand, if there is a need to parse the string, then it’s better to wrap it in double-quotes. Here is how to do it:

You’ll get this as the output:

Placing the string inside single quotes won’t parse the variables inside it.

PHP Strings: Using Heredoc for Complex Strings:

What do we mean here by “complex strings”?

These are the PHP strings that consist of large blocks of multiple lines. Also, they contain complex expressions such as $example->languages[0] . Here, the heredoc syntax is the best alternative to double quotes when dealing with the respective kinds of strings. Moreover, you can efficiently place the HTML tags inside it.

Let’s see an example, you want to store an HTML template code in a PHP string, along with adding some expressions inside it. Here, using double quotes will reduce the readability of your code. But heredoc will solve it for you just like the code given below:

According to the update in heredoc syntax in PHP 7.3.0, a semicolon isn’t required after the ending identifier. Also, the identifier can be indented through spaces or tabs. However, this indentation will be stripped from the string, if presen t.

PHP String: Where To Use Newdoc Syntax?

As stated above, newdoc syntax is similar to the heredoc syntax, except for using single quotes with the identifier. Your answer resides here.

It would be good to use the newdoc syntax when dealing with large blocks of text without any expressions. Certainly, the respective syntax will increase the readability of the code and work similarly to single quotes.

Please have a look at this example for better understanding its usage:

The newdoc syntax was also updated in PHP 7.3.0, similar to the heredoc syntax.

PHP Quotes in String: Adding Quotes Inside a String:

Now, let’s deal with the situation when the PHP string literal contains quotes inside it .

If you have wrapped the string in single quotes then you can easily use double quotes inside it. However, you’ll need to use the PHP escape string “’“ for adding a single quote in the respective string.

Have a look at these example strings:

If the string is already in double-quotes then you don’t need to use “’“ for inserting a single quote. On the other hand, if you wish to add double quotes then you’ll need to add the escape sequence “”.” Please refer to the code snippet attached below:

Interestingly, here both single and double quote examples will print the same result:

PHP String Interpolation vs Linkage Using “.” Operator:

PHP string interpolation refers to the process of using variables or array and object values directly inside the string. And in the case of adding complex expressions, it is about wrapping the respective expression in curly braces inside the string. Indeed, it is easy to use and quite readable. Moreover, it is the best choice for optimizing performance.

Here is a simple example of the PHP string interpolation:

If you want to use the “.” operator to link the variables with your string, it works as well. But it will reduce the overall performance of your PHP program along with decreasing its readability.

Please have a look at this example:

PHP to String: Repeating the Same Content:

Tired of copy-pasting the same content into another PHP string? We have a way for you to avoid doing this.

For example, you have a string and now, you want to create a new string by repeating the content of your original string . Although you can achieve it by copy-pasting the string multiple times in the new string, it is not a recommended way.

Instead, you can use the str_repeat() function in PHP version 4+ to create a new PHP string. Here is the syntax: str_repeat(string,repeat). Certainly, you can specify the number of times by which you want to repeat the string.

You can check out this code for a better understanding:

Here is the new string:

Coming towards the end of the basics of the PHP string , you learned to create strings in different ways while understanding the logic behind using a specific way. Now, let’s have a look at some important points to efficiently fulfill the purpose of the above discussion.

How to create a php string

  • You can create a PHP string in four different ways
  • You can add the string in single quotes if it is purely a PHP string literal
  • If there is a need to parse the string, wrap it in the double quotes
  • Use the heredoc and newdoc syntaxes when dealing with large blocks of text
  • The heredoc syntax works similar to double quotes while the newdoc syntax serves the purpose that is similar to single quotes
  • You can use a double quote inside a double-quoted string by using a backslash that precedes a double quote and vice versa
  • The PHP string interpolation is the best way to add variables and other values inside a string

Still, there is a lot of stuff related to PHP strings but we don’t want to pour everything at once as it would lead to confusion. Once you are clear with the basics, you can move further to playing with string functions.

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  5. PHP : Using quotes in string data / variables

    php variable string double quotes

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    php variable string double quotes

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  1. PHP: Using a variable inside a double quotes

    PHP: Using a variable inside a double quotes Ask Question Asked 11 years, 6 months ago Modified 6 years, 6 months ago Viewed 65k times Part of PHP Collective 28 please check the following code. $imagebaseurl = 'support/content_editor/uploads/$name';

  2. PHP: Strings

    The simplest way to specify a string is to enclose it in single quotes (the character ' ). To specify a literal single quote, escape it with a backslash ( \ ). To specify a literal backslash, double it ( \\ ).

  3. php

    php - Single quotes or double quotes for variable concatenation? - Stack Overflow Single quotes or double quotes for variable concatenation? [closed] Ask Question Asked 13 years, 4 months ago Modified 10 years, 11 months ago Viewed 58k times Part of PHP Collective 26 Closed. This question is opinion-based. It is not currently accepting answers.

  4. Using multiple quotations in PHP codes

    1 Let's say this is my script down here, as you can see I've used multiple " and '. These quotations conflict in ending the current php variable, so it basically sees this: $message = "<?php echo '<div class=" As a string, whilst the quotation is only to define the class, not to end the variable.

  5. PHP Wrap a string in double quotes

    PHP Wrap a string in double quotes. I'm attempting to wrap a user-inputted string in double quotes for output but I want to make sure I don't end up with double double quotes on either side of the string. For example, if a user posts. I can do this fairly easily using the code below, however I'm concerned that this may get slow if I'm looping ...

  6. How To Work with Strings in PHP

    Since you're using single quotes to create our string, you can include double quotes within it to be part of the final string that PHP outputs. If you want to render the \' sequence, you must use three backslashes ( \\\' ). First \\ to render the backslash itself, and then \' to render the apostrophe.

  7. single and double quotes in php variable

    How can I combine this code with all single and double quotes as it should be. I have tried several combinations and I can't make it work. ... I follow the rule of: php strings are encapsulated in single quote, so attributes of html are in double quotes. ... Escape quotes in a variable with PHP. 1. Javascript String with Single Quote printed ...

  8. Learn PHP: Learn PHP Variables Cheatsheet

    Parsing Variables within PHP Strings In PHP, variables can be parsed within strings specified with double quotes ( " ). This means that within the string, the computer will replace an occurence of a variable with that variable's value.

  9. What is the difference between single-quoted and double-quoted strings

    Single or double quotes in PHP programming are used to define a string. But, there are lots of differences between these two. Single-quoted Strings: It is the easiest way to define a string. You can use it when you want the string to be exactly as it is written.

  10. Quoting String Constants

    Quoting String Constants. There are three ways to write a literal string in your program: using single quotes, double quotes, and the here document ( heredoc) format derived from the Unix shell. These methods differ in whether they recognize special escape sequences that let you encode other characters or interpolate variables.

  11. PHP Strings (Single quoted, Double quoted, Heredoc and Nowdoc) Datatype

    In PHP strings are series of characters. PHP only supports a 256-character set. PHP does not support Unicodes PHP string can be as large as 2GB . There are 4 types of Strings in PHP: 1. Single quoted 2. Double quoted 3. Heredoc syntax 4. Nowdoc syntax (since PHP 5.3.0) Single quoted Strings in PHP

  12. Differentiate Single and Double Quotes in PHP

    The advantage of double quotes over single quotes is that we need not concatenate the string and the variables using the . operator. However, as the variables need to be evaluated in the string, using double quotes will be slightly slower than using the single quote. For example, create a variable $name and write the string Bond to it.

  13. PHP: addslashes

    double quote ( ") backslash ( \) NUL (the NUL byte) A use case of addslashes () is escaping the aforementioned characters in a string that is to be evaluated by PHP: <?php $str = "O'Reilly?"; eval ("echo '" . addslashes($str) . "';"); ?> The addslashes () is sometimes incorrectly used to try to prevent SQL Injection.

  14. How to link string literals with variables in PHP?

    Single quotes with concatenation, Double quotes with in-string variable, sprintf (vsprintf) function, heredoc (newdoc) syntax. We're going to focus on each option, its strong and weak points. First, let's dive into the theory. Theory #1 Single quotes with concatenation . A single-quoted string does not have variables within it interpreted ...

  15. PHP single vs double quotes explained

    When using double quotes, you can put variables and escape sequences in the string as follows: <?php $word = "morning"; print "good $word!"; print "\r\nThe weather is good today."; The output will be: good morning! The weather is good today. When you use single quotes, then you can't put a string directly as shown below:

  16. Double Quotes vs Single Quotes in PHP

    // Using single quotes to save a string in a variable: $recipe_title = 'Meatball Spaghetti'; // Using single quotes to write something on the screen: echo '<h1>Meatball Spaghetti</h1>'; // The line above will get output as-is in your code: <h1>Meatball Spaghetti</h1> Line breaks with single quotes

  17. A Guide to PHP Strings

    Double Quotes ( " ") Heredoc Syntax ( <<<IDENTIFIER) Nowdoc Syntax ( <<<'IDENTIFIER') Over this guide, we will be going over each of the different ways to define a string within the PHP language. If you are just getting started with PHP, we recommend focusing on single and double-quotes.

  18. PHP String: Everything You Need To Know Before Getting Started

    PHP String Variable: Single Quotes vs Double Quotes: - PHP String Variable Example With Single Quotes - PHP String Variable Example With Double Quotes PHP Strings: Using Heredoc for Complex Strings: - Complex String Example Note on Complex Strings PHP String: Where To Use Newdoc Syntax? - Newdoc Syntax Example - Note on Newdoc Syntax

  19. PHP

    how I could insert variables, and put them into single quotes, into a double quotes string. Don't do that. It leaves you vulnerable to SQL injection attacks. Instead use prepared statements with bound parameters as described in this post.