preparing string for compare

psfc.php

<?php 

function psfc ($string){
    $string =
        strtolower(str_replace(' ', '',convert_numbers_to_english(preg_replace('/\s+/', '', $string))));
    return $string;
}


function convert_numbers_to_english($string) {
    $persian = ['۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹'];
    $arabic = ['٩', '٨', '٧', '٦', '٥', '٤', '٣', '٢', '١','٠'];

    $num = range(0, 9);
    $convertedPersianNums = str_replace($persian, $num, $string);
    $englishNumbersOnly = str_replace($arabic, $num, $convertedPersianNums);

    return $englishNumbersOnly;
}


?>