3v4l.org

run code in 300+ PHP versions simultaneously
<?php $ary1 = array( array( 'sn' => '123', 'name' => 'whatever', ), array( 'sn' => '234', 'name' => 'whatever', ), ); $ary2 = array( array( 'sn' => '123', 'gender' => 'male', ), array( 'sn' => '234', 'gender' => 'female', ), ); $res = []; foreach (array_merge($ary1, $ary2) as $a) { $res[$a['sn']] = (isset($res[$a['sn']])) ? array_merge($res[$a['sn']], $a) : $a; } var_dump($res);
Output for 5.5.24 - 5.5.35, 5.6.8 - 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [123]=> array(3) { ["sn"]=> string(3) "123" ["name"]=> string(8) "whatever" ["gender"]=> string(4) "male" } [234]=> array(3) { ["sn"]=> string(3) "234" ["name"]=> string(8) "whatever" ["gender"]=> string(6) "female" } }

preferences:
154.25 ms | 404 KiB | 211 Q