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<?php $arr = array( 1 => "a", 2 => "b", 4 => "c", 8 => "d", 16 => "e", 32 => "f" ); $filter = 101101; $filter_arr = str_split($filter); $new_arr = array(); $i = 0; foreach ($arr as $key => $val) { if ($filter_arr[$i] == 1) { $new_arr[$key] = $val; } $i++; } print_r($new_arr);
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