# PHP addcslashes() Function

PHP String Reference

## Example

Add a backslash in front of the character "W":

<?php
$str = addcslashes("Hello World!","W");
echo($str);
?>
Run example »

## Definition and Usage

The addcslashes() function returns a string with backslashes in front of the specified characters.

Note: The addcslashes() function is case-sensitive.

Note: Be careful using addcslashes() on 0 (NULL), r (carriage return), n (newline), f (form feed), t (tab) and v (vertical tab). In PHP, \0, \r, \n, \t, \f and \v are predefined escape sequences.

## Syntax

addcslashes(string,characters)

Parameter | Description
--- | ---
string | Required. Specifies the string to be escaped
characters | Required. Specifies the characters or range of characters to be escaped

## Technical Details

Return Value: | Returns the escaped string
PHP Version: | 4+

## More Examples

## Example 1

Add backslashes to certain characters in a string:

<?php
$str = "Welcome to my humble Homepage!";
echo $str."<br>";
echo addcslashes($str,'m')."<br>";
echo addcslashes($str,'H')."<br>";
?>
Run example »

## Example 2

Add backslashes to a range of characters in a string:

<?php
$str = "Welcome to my humble Homepage!";
echo $str."<br>";
echo addcslashes($str,'A..Z')."<br>";
echo addcslashes($str,'a..z')."<br>";
echo addcslashes($str,'a..g');
?>
Run example »

PHP String Reference

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