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<?php $firstArray =Array ( 1 => Array ( 'MemberList' => Array ( 100, '5d6', '5d7', ) ), 3 => Array ( 'MemberList' => Array ( '5d8', 200 ) ) ); $secondArray = [100,200]; $newArray = array_map( function ($v) use ($secondArray) { return ['MemberList' => array_diff($v['MemberList'], $secondArray)]; }, $firstArray ); print_r($newArray);

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