PHP String Functions Series Part 1
addcslashes() Function [PHP Version: 4+]
Returns a string with backslashes in front of the specified characters. (Quote string with slashes in a C style)
The addcslashes() function is case-sensitive.
Be careful if you choose to escape characters 0, a, b, f, n, r, t and v. They will be converted to , a, b, f, n, r, t and v, all of which are predefined escape sequences in C.
Many of these sequences are also defined in other C-derived languages, including PHP, meaning that you may not get the desired result if you use the output of addcslashes() to generate code in those languages with these characters.
Syntax
addcslashes(string, characters_list)
where
string = the string to be escaped, it is Required
characters_list = Required. Specifies the characters or range of characters to be escaped
Examples
$string = addcslashes("Yogesh Chauhan.com!","h");
echo($string);
//output
Yogesh Chauhan.com!
$string = addcslashes("Yogesh Chauhan.com!","Y");
echo($string);
//output
Yogesh Chauhan.com!
$string = addcslashes("Yogesh Chauhan.com!","a..z");
echo($string);
//output
Yogesh Chauhan.com!
$string = addcslashes("Yogesh Chauhan.com!","a..g");
echo($string);
//output
Yogesh Chauhan.com!addslashes() Function [PHP Version: 4+]
Returns a string with backslashes added before characters that need to be escaped.
These characters are:
1. single quote (‘)
2. double quote (“)
3. backslash ()
4. NUL (the NUL byte)
Syntax
addslashes(string)where string = the string to be escaped, it is Required
P.S.: Prior to PHP 5.4.0, the PHP directive magic_quotes_gpc was on by default and it essentially ran addslashes() on all GET, POST and COOKIE data. addslashes() must not be used on strings that have already been escaped with magic_quotes_gpc, as the strings will be double escaped. get_magic_quotes_gpc() can be used to check if magic_quotes_gpc is on.
The addslashes() is sometimes incorrectly used to try to prevent SQL Injection. Instead, database-specific escaping functions and/or prepared statements should be used.
Examples
$str = "Is your name O'Reilly?";
echo addslashes($str);
//output
Is your name O\'Reilly?Sources
addcslashes addslashes functions
