3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [ 'firstname', 'bob', 'lastname', 'alex', 'foo', ]; var_export( array_combine( ...array_map( null, ...array_chunk($array, 2) ) ) );
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 'firstname' => 'bob', 'lastname' => 'alex', 'foo' => NULL, )
preferences:
46.39 ms | 845 KiB | 4 Q