3v4l.org

run code in 300+ PHP versions simultaneously
<?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]] = $value; } print_r($result);
Output for 5.6.38, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
Array ( [Newcastle Upon Tyne] => 18 [Gateshead] => 17 [Sunderland] => 3 )

preferences:
143.67 ms | 408 KiB | 5 Q