Note that mb_ereg() does not support the \uFFFF unicode syntax but uses \x{FFFF} instead:
<?PHP
$text = 'Peter is a boy.'; // english
$text = 'بيتر هو صبي.'; // arabic
//$text = 'פיטר הוא ילד.'; // hebrew
mb_regex_encoding('UTF-8');
if(mb_ereg('[\x{0600}-\x{06FF}]', $text)) // arabic range
//if(mb_ereg('[\x{0590}-\x{05FF}]', $text)) // hebrew range
{
echo "Text has some arabic/hebrew characters.";
}
else
{
echo "Text doesnt have arabic/hebrew characters.";
}
?>