PHP Run Script For Specific IP Address

<?php
// Write your IP instead of xxx.xxx.xxx.xxx

if(@$_SERVER['REMOTE_ADDR'] == 'xxx.xxx.xxx.xxx'|| @$_SERVER['HTTP_X_FORWARDED_FOR'] == 'xxx.xxx.xxx.xxx' ){
    define( 'TESTINGMOD',TRUE);
}else{
    define( 'TESTINGMOD',FALSE);
}

if(TESTINGMOD){
    error_reporting(E_ALL);    ini_set('display_errors', 1);
    // Write test code for specific IP address in live site
}else{
    error_reporting(0);
}
?>