w3resource

PHP : addcslashes() function

Description

The addcslashes() function is used to add backslashes in front of the specified characters in a string.
Note : In PHP \0 (NULL), \r (carriage return), \n (newline), \f (form feed), \v (vertical tab) and \t (tab) are predefined escape sequences.

Version:

(PHP 4 and above)

Syntax:

 addcslashes (string_name, charlist)

Parameters:

Name Description Required /
Optional
Type
string_name The string to be escaped.. Required String
charlist Sequence of characters. Optional String

Return values:

The escaped string.

Value Type: String.

Pictorial Presentation:

php-string-addcslashes()

Example:

<?php
echo addcslashes('w3resource.com', '0..9');
echo '<br>';
echo addcslashes('w3resource.com', '.');
echo '<br>';
echo addcslashes('Welcome to w3resource.com','t');
echo '<br>';
echo addcslashes('Welcome to w3resource.com','A..Z');
echo '<br>';
?>

Output:

w\3resource.com
w3resource\.com
Welcome \to w3resource.com
\Welcome   to w3resource.com

View the example in the browser

See also

PHP Function Reference

Previous: String
Next: addslashes



PHP: Tips of the Day

Get the full URL in PHP

Have a look at $_SERVER['REQUEST_URI'], i.e.

Example:

$actual_link = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

(Note that the double quoted string syntax is perfectly correct)

If you want to support both HTTP and HTTPS, you can use

$actual_link = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

Editor's note: using this code has security implications. The client can set HTTP_HOST and REQUEST_URI to any arbitrary value it wants.

Ref : https://bit.ly/2ZYItNJ