- preg_match: documentation ( source)
<?php
$address = 'One Infinite Loop, Cupertino 95014';
$cityZipCodeRegex = '/^[^,]+,\s*(.+?)\s*(\d{5})$/';
preg_match($cityZipCodeRegex, $address, $matches);
[, $city, $zipCode] = $matches;
//saveCityZipCode($city, $zipCode);