escape or escape_str

[eluser]berkan[/eluser]
Thanks for reply.

Why does escape function adds single quotes to the string value. If I modify, will that be a security problem.

Code:

function escape($str)
    {    
        switch (gettype($str))
        {
            case 'string'    :    $str = "'".$this->escape_str($str)."'";
                break;
            case 'boolean'    :    $str = ($str === FALSE) ? 0 : 1;
                break;
            default            :    $str = ($str === NULL) ? 'NULL' : $str;
                break;
        }        

        return $str;
    }