Online PHP editor | refs for KIZBH

<?php function camelCaseToUnderscore($input) { return strtoupper(preg_replace('/(?<!^)[A-Z]/', ' $0', $input)); } echo camelCaseToUnderscore('CamelCaseForTheWin'), "\n"; echo camelCaseToUnderscore('ACar'), "\n"; echo camelCaseToUnderscore('buyACar'), "\n"; echo camelCaseToUnderscore('XML'), "\n"; echo camelCaseToUnderscore('SimpleXML'), "\n";