I want to add a backslash to all single quotes. What should I use? _ PHP Tutorial

I want to add a backslash to all single quotes. What should I use. First, please refer to the addslashes () function in English, which can achieve the functions you want, you should also refer to the magic_quotes_gpc option set by php3.ini. The ereg_replace () function can achieve what you need first. For more information, see the addslashes () function in english. it can achieve the functions you want. you should also refer to the magic_quotes_gpc option set in php3.ini.
The ereg_replace () function can achieve the expected result. the procedure is as follows:
$ Escaped = ereg_replace ("'", "'", $ input );

Addslashes () function, which can achieve the functions you want. you should also refer to the magic_quotes_gpc option set by php3.ini. The ereg_replace () function can reach what you want...