convert Persian/Arabic numbers to English numbers

this is better. we have two type of digits in arabic and persian. we must change all.

function convert($string) {
    $persinaDigits1= array('۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹');
    $persinaDigits2= array('٩', '٨', '٧', '٦', '٥', '٤', '٣', '٢', '١', '٠');
    $allPersianDigits=array_merge($persinaDigits1, $persinaDigits2);
    $replaces = array('0','1','2','3','4','5','6','7','8','9','0','1','2','3','4','5','6','7','8','9');
    return str_replace($allPersianDigits, $replaces , $string);
}

thanks @Palladium

Be Careful when copying the code! Check twice how the array is presented in your editor or your will be in trouble!

Here's a short function:

function convert($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;
}

You can use the unicode instead of the characters in $persian (I think).

Because people in the Persian & Arabic region maybe use each other keyboard types, this is the complete solution to convert both types.

Based on @palladium answer.

function convert2english($string) {
    $newNumbers = range(0, 9);
    // 1. Persian HTML decimal
    $persianDecimal = array('۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹');
    // 2. Arabic HTML decimal
    $arabicDecimal = array('٠', '١', '٢', '٣', '٤', '٥', '٦', '٧', '٨', '٩');
    // 3. Arabic Numeric
    $arabic = array('٠', '١', '٢', '٣', '٤', '٥', '٦', '٧', '٨', '٩');
    // 4. Persian Numeric
    $persian = array('۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹');

    $string =  str_replace($persianDecimal, $newNumbers, $string);
    $string =  str_replace($arabicDecimal, $newNumbers, $string);
    $string =  str_replace($arabic, $newNumbers, $string);
    return str_replace($persian, $newNumbers, $string);
}

I use this function. It converts both Persian and Arabic digits to English:

function faTOen($string) {
    return strtr($string, array('۰'=>'0', '۱'=>'1', '۲'=>'2', '۳'=>'3', '۴'=>'4', '۵'=>'5', '۶'=>'6', '۷'=>'7', '۸'=>'8', '۹'=>'9', '٠'=>'0', '١'=>'1', '٢'=>'2', '٣'=>'3', '٤'=>'4', '٥'=>'5', '٦'=>'6', '٧'=>'7', '٨'=>'8', '٩'=>'9'));
}

sample:

echo faTOen("۰۱۲۳۴۵۶۷۸۹٠١٢٣٤٥٦٧٨٩"); // 01234567890123456789

Also you can convert English to Persian the same way:

function enToFa($string) {
    return strtr($string, array('0'=>'۰','1'=>'۱','2'=>'۲','3'=>'۳','4'=>'۴','5'=>'۵','6'=>'۶','7'=>'۷','8'=>'۸','9'=>'۹'));
}

Or English to Arabic:

function enToAr($string) {
    return strtr($string, array('0'=>'٠','1'=>'١','2'=>'٢','3'=>'٣','4'=>'٤','5'=>'٥','6'=>'٦','7'=>'٧','8'=>'٨','9'=>'٩'));
}