3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = [['A','B','C'],[1,2,3],[4,5,6],[7,8,9]]; $headers = array_shift($x); array_walk( $x, function(&$row) use ($headers) { $row = array_combine($headers, $row); } ); $y = var_export($x,true); echo $y;
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array ( 0 => array ( 'A' => 1, 'B' => 2, 'C' => 3, ), 1 => array ( 'A' => 4, 'B' => 5, 'C' => 6, ), 2 => array ( 'A' => 7, 'B' => 8, 'C' => 9, ), )

preferences:
214.17 ms | 404 KiB | 249 Q