putting a backslash before apostrophe

Question

Which function processes a string putting a backslash before every apostrophes? In other words, I want that

$string="L'isola";
echo somefunction($string);

returns:

L\'isola

Answer 1

You have to use addslashes() method to escape the quote Ex:

<?php
$str = "Is your name O'reilly?";

// Outputs: Is your name O\'reilly?
echo addslashes($str);
?> 

and the reverse method is stripslashes() which remove slashes Ex:

<?php
$str = "Is your name O\'reilly?";

// Outputs: Is your name O'reilly?
echo stripslashes($str);
?>

Answer 2

you can use the addslashes() function more information can be found here

Answer 3

str_replace will do that for you.

str_replace("'", "\'", $mystring);