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<?php $color = [ ['id' => 1, 'color' => 'red'], ['id' => 2, 'color' => 'green'], ['id' => 3, 'color' => 'blue'], ]; $size = [ ['id' => 1, 'size' => 'SM'], ['id' => 2, 'size' => 'XL'], ['id' => 4, 'size' => 'LG'], ['id' => 3, 'size' => 'MD'], ]; foreach(array_merge($color, $size) as $el){ $merged[$el['id']] = ($merged[$el['id']] ?? []) + $el; } var_export($merged);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 1 => array ( 'id' => 1, 'color' => 'red', 'size' => 'SM', ), 2 => array ( 'id' => 2, 'color' => 'green', 'size' => 'XL', ), 3 => array ( 'id' => 3, 'color' => 'blue', 'size' => 'MD', ), 4 => array ( 'id' => 4, 'size' => 'LG', ), )

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