Sanitize Mobile Number

function sanitizeMobileNumber($mobile, $prefix = '0')
{
    $mobile = ltrim(trim($mobile), '.+80');
    $mobile = str_replace([' ', '-', '.', '+'], '', $mobile);
    $mobile = strrev(substr(strrev($mobile), 0, 10));

    if (!in_array(substr($mobile, 0, 2), ['15', '16', '17', '18', '19', '13']) || strlen($mobile) != 10) {
        return null;
    }

    return $prefix.$mobile;
}