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<?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']] = array_merge($res[$a['sn']], $a) ?? $a; } var_dump($res);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 123 in /in/1SE0o on line 27 Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/1SE0o:27 Stack trace: #0 /in/1SE0o(27): array_merge(NULL, Array) #1 {main} thrown in /in/1SE0o on line 27
Process exited with code 255.

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