codeigniter mysql_escape_string error

 This function is deprecated use mysql_real_escape_string() instead.

You use   >= php 5.3

System > database > drivers > mysql > mysql_driver.php

open mysql_driver.php  

find  “escape_str” . ( 301. row )

this code delete =>

else if( function_exists(‘mysql_escape_string’) ){
$str = mysql_escape_string($st);
}