get diff in hesk language file

difflang.php

<?php 
//put this file in the root of language folder
define('IN_SCRIPT',1);
include 'en/text.php';
$en_langs = $hesklang;
$hesklang = null;
include 'fr/text.php';
print 'non trouv&eacute; dans en';
$infr = array_diff_key($hesklang, $en_langs);
print '<pre>';
foreach ($infr as $key => $value) {
    print '\\\\'.htmlentities($value).'<br>';
    print '$hesklang[\''.$key.'\']=\'\';<br>';
}
print '</pre>';
print 'non trouv&eacute; dans fr';
$inen = array_diff_key($en_langs, $hesklang);
print '<pre>';
foreach ($inen as $key => $value) {
    print '\\\\'.htmlentities($value).'<br>';
    print '$hesklang[\''.$key.'\']=\'\';<br>';
}
print '</pre>';