Php array filtering problem?

How can I filter an array like this into {code...}? How can I filter an array like this?

["Q"] => array(4) {        [0] => array(11) {          ["id"] => string(1) "1"，["k"] => string(1) "Q"        }         [1] => array(11) {          ["id"] => string(1) "2"，["k"] => string(1) "H"        }        [2] => array(11) {          ["id"] => string(1) "3"， ["k"] => string(1) "V"        }         [3] => array(11) {          ["id"] => string(1) "4"，  ["k"] => string(1) "V"        }}["V"] => array(4) {        [0] => array(11) {          ["id"] => string(1) "1"，["k"] => string(1) "Q"        }         [1] => array(11) {          ["id"] => string(1) "2"，["k"] => string(1) "H"        }        [2] => array(11) {          ["id"] => string(1) "3"， ["k"] => string(1) "V"        }         [3] => array(11) {          ["id"] => string(1) "4"，  ["k"] => string(1) "V"        }}["H"] => array(4) {        [0] => array(11) {          ["id"] => string(1) "1"，["k"] => string(1) "Q"        }         [1] => array(11) {          ["id"] => string(1) "2"，["k"] => string(1) "H"        }        [2] => array(11) {          ["id"] => string(1) "3"， ["k"] => string(1) "V"        }         [3] => array(11) {          ["id"] => string(1) "4"，  ["k"] => string(1) "V"        }}

Filter it like this

["Q"] => array(1) {        [0] => array(11) {          ["id"] => string(1) "1"          ["k"] => string(1) "Q"        }}["V"] => array(2) {        [0] => array(11) {          ["id"] => string(1) "3"          ["k"] => string(1) "V"        }         [1] => array(11) {          ["id"] => string(1) "4"          ["k"] => string(1) "V"        }}["H"] => array(1) {         [0] => array(11) {          ["id"] => string(1) "2"          ["k"] => string(1) "H"        }}

Reply content:

How to overwrite an array like this?

["Q"] => array(4) {        [0] => array(11) {          ["id"] => string(1) "1"，["k"] => string(1) "Q"        }         [1] => array(11) {          ["id"] => string(1) "2"，["k"] => string(1) "H"        }        [2] => array(11) {          ["id"] => string(1) "3"， ["k"] => string(1) "V"        }         [3] => array(11) {          ["id"] => string(1) "4"，  ["k"] => string(1) "V"        }}["V"] => array(4) {        [0] => array(11) {          ["id"] => string(1) "1"，["k"] => string(1) "Q"        }         [1] => array(11) {          ["id"] => string(1) "2"，["k"] => string(1) "H"        }        [2] => array(11) {          ["id"] => string(1) "3"， ["k"] => string(1) "V"        }         [3] => array(11) {          ["id"] => string(1) "4"，  ["k"] => string(1) "V"        }}["H"] => array(4) {        [0] => array(11) {          ["id"] => string(1) "1"，["k"] => string(1) "Q"        }         [1] => array(11) {          ["id"] => string(1) "2"，["k"] => string(1) "H"        }        [2] => array(11) {          ["id"] => string(1) "3"， ["k"] => string(1) "V"        }         [3] => array(11) {          ["id"] => string(1) "4"，  ["k"] => string(1) "V"        }}

Filter it like this

["Q"] => array(1) {        [0] => array(11) {          ["id"] => string(1) "1"          ["k"] => string(1) "Q"        }}["V"] => array(2) {        [0] => array(11) {          ["id"] => string(1) "3"          ["k"] => string(1) "V"        }         [1] => array(11) {          ["id"] => string(1) "4"          ["k"] => string(1) "V"        }}["H"] => array(1) {         [0] => array(11) {          ["id"] => string(1) "2"          ["k"] => string(1) "H"        }}

  array(        array(            'id'=>1,            'k'=>'Q'        ),        array(            'id'=>2,            'k'=>'H'        ),        array(            'id'=>3,            'k'=>'V'        ),        array(            'id'=>4,            'k'=>'V'        ),                        ),        'V'=>array(        array(            'id'=>1,            'k'=>'Q'        ),        array(            'id'=>2,            'k'=>'H'        ),        array(            'id'=>3,            'k'=>'V'        ),        array(            'id'=>4,            'k'=>'V'        ),        ),    'H'=>array(        array(            'id'=>1,            'k'=>'Q'        ),        array(            'id'=>2,            'k'=>'H'        ),        array(            'id'=>3,            'k'=>'V'        ),        array(            'id'=>4,            'k'=>'V'        ),        ),    );echo '
';print_r($arr);$new_arr = array();foreach($arr as $key=>$val) {    foreach($val as $k=>$v) {        if($key == $v['k']) {            $new_arr[$key][] = $v;        }    }}echo '';print_r($new_arr);
                                        
                                    
Array_filter ($ arr, fun );
In fun, the array key and k are used to determine whether the unset is not equal
                                        
                                    
$keys = array_keys($arr);$newArr = array();$i = 0;foreach ($arr as $key => $value) {    $newArr[$key] = array_filter($value, function ($val) {        GLOBAL $keys;        GLOBAL $i;        return $val["k"] == $keys[$i];    });     $i++;}