دالة التاكد من ان النص با اللغة العربية فقط

function arabic_text($text){
$search = array("ا","أ","إ","ب","ت","ث","ج","ح","خ","د","ذ","ر",
"ز","س","ش","ص","ظ","ط","ع","غ","ف","ق","ك","ل","م","ن","ه","و","ي","ء","ة","ؤ","ئ"," ");
$new_string = str_ireplace($search , "5" , $text);
$new_string_int = str_ireplace("5","",$new_string);
if(eregi("[a-z0-9/\@!#)$%*_^.+|÷(&-]",$text)){
return false;
}else if(empty($new_string_int)){
return true;
}else{
return false;
}

if(arabic_text($text)){
echo "ok";
}else{
echo "error";
}