PHP addcslashes() Function: Syntax, Usage, and Examples

addcslashes() Function Syntax

string addcslashes(string $str, string $charlist)

The addcslashes() function is a PHP string handling function that adds backslashes before specified characters in a string.

Parameters: $str is the input string to be processed. $charlist is a string that lists the characters that should be escaped with a backslash.

The function's purpose is to prepend a backslash to each character listed in $charlist, which is useful when special characters need to be escaped in certain contexts.

Usage of addcslashes()

$str = "Hello, World!";
$charlist = "W";

echo addcslashes($str, $charlist);

Output: Hello, \World! In this example, the character "W" in the string "Hello, World!" is escaped with a backslash.

Note that addcslashes() only adds backslashes before the characters specified in $charlist; it does not escape other characters. To escape an entire string, use PHP's built‑in addslashes() function.

The function can also handle special characters such as single quotes ('), double quotes ("), and backslashes (\\), which may cause errors in certain contexts if not escaped.

Escaping Special Characters with addcslashes()

$str = 'I\'m a "PHP" developer.';
$charlist = "'\"";

echo addcslashes($str, $charlist);

Output: I\'m a \"PHP\" developer. This example demonstrates escaping both single and double quotes in the string.

Summary

The addcslashes() function is a PHP string processing function that adds backslashes before specified characters, helping to avoid unintended results in specific contexts. It can be used to escape special characters to ensure string correctness.

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