<?php $arrayFirst = [ "index" => [ 'a' => '1', ], [ 'a' => '2', ] ]; $arraySecond = [ "index" => [ 'b' => '1', ], [ 'b' => '2', ] ]; var_export( array_map( function(...$items) { return array_merge(...$items); }, $arrayFirst, $arraySecond ) );
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