function removeSpecificCharactersFromString($str, $charsToRemove) {
foreach ($charsToRemove as $ch) {
$str = str_replace($ch, "", $str);
}
return $str;
}
$phone = "(555) 555-5555";
$charsToRemove = array('(', ')', '-');
$phone = removeSpecificCharactersFromString($phone, $charsToRemove);
echo $phone;
/*
run:
555 5555555
*/