Online PHP editor | refs for YWYLY

<?php $data = [ 'Newcastle Upon Tyne, Tyne and Wear, England' => 18, 'Gateshead, Tyne and Wear, England' => 17, 'Sunderland, Tyne and Wear, England' => 3, ]; $result = []; /*foreach($data as $key=>$value){ $result[explode(',',$key)[0]] = $value; }*/ array_walk($data, function (&$value,$key) use (&$result) { $splitted = explode(",",$key); $result[ $splitted[0] ] = $value; }); print_r($result);