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<?php $array1 = array ( '2019-04-29' => array ( 0 => 366, 1 => 82, 2 => 44 ), '2019-04-30' => array ( 0 => 330, 1 => 115, 2 => 55 ) ); $array2 = array(492, 500); $array1 = array_values($array1); foreach ($array2 as $k => &$v) { $v = array_merge(array($v), $array1[$k]); } print_r($array2);

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