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<?php $array1 = array ( 'nested' => array ( 'orig' => 1, 'numarr' => array( 1, 2, 3, 4, 5 ) ) ); // array2 $array2 = array ( 'nested' => Array ( 'numarr' => Array ( 6, 7 ) ) ); print_r($array1);

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