3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr1 = [2 => [0 => 41000, 1 => 31079], 3 => [0 => 42963, 1 => 41189]]; $arr2 = [2 => [0 => 40213, 1 => 42054], 3 => [0 => 42998, 1 => 34567]]; function addArray(&$bucket, $water) { foreach ($water as $key => $drop) { $bucket[$key] = array_merge($bucket[$key] ?? [], $drop); } } $combined = []; addArray($combined, $arr1); addArray($combined, $arr2); var_export($combined);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 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 ( 2 => array ( 0 => 41000, 1 => 31079, 2 => 40213, 3 => 42054, ), 3 => array ( 0 => 42963, 1 => 41189, 2 => 42998, 3 => 34567, ), )
preferences:
81.16 ms | 1268 KiB | 4 Q