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<?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 git.master_jit, git.master, rfc.property-hooks
array ( 2 => array ( 0 => 41000, 1 => 31079, 2 => 40213, 3 => 42054, ), 3 => array ( 0 => 42963, 1 => 41189, 2 => 42998, 3 => 34567, ), )

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