PHP addcslashes() Function
Quick summary: The PHP addcslashes() function returns a string with backslashes before the characters that are listed in the characters parameter.
PHP addcslashes() Syntax
addcslashes(string $string, string $characters): stringPHP
PHP addcslashes() Basic examples
echo addcslashes("Hello World", "A..Z");PHP
Output:
\H\ello \W\orldEscapes uppercase letters using a character range.
echo addcslashes("foo[ ]", "[]");PHP
Output:
foo\[ \]Escapes specific characters.
PHP addcslashes() Real-world usage
$input = "Line1\nLine2";
echo addcslashes($input, "\n");PHP
Output:
Line1\\nLine2Escapes newline characters for safe output.
PHP addcslashes() Edge cases
echo addcslashes("test", "");PHP
Output:
testIf no characters are specified, string remains unchanged.
PHP addcslashes() Common mistakes
Confusing addcslashes() with addslashes()
addcslashes() escapes based on a character list or range.
Incorrect
addcslashes("O'Reilly", "'");Correct
addslashes("O'Reilly");Use addslashes() for simple quote escaping.
PHP addcslashes() Frequently Asked Questions
What does addcslashes() do?
Escapes characters with backslashes.
Use case?
Preparing strings for output.
Difference from addslashes()?
Allows custom character list.
Common mistake?
Wrong char range.
Does it modify string?
Returns new string.
Handles binary?
Yes.
Performance?
Fast.
Safe?
Depends on use.
Alternative?
preg_replace().
Supports ranges?
Yes.
Used in escaping?
Yes.
Best practice?
Use carefully.