How can PHP efficiently classify array elements based on key values?

As shown in the following code: {code...} hope the great God can give me a thought. Thank you for the following code:

$ Arr = [0 => ["category" => "red", "price" => 95], 1 => ["category" => "blue ", "price" => 85], 2 => ["category" => "red", "price" => 75]; // I want to classify the preceding data as the following array ["red" => [0 => ["category" => "red", "price" => 95], 1 => ["category" => "red", "price" => 75], "blue" => [0 => ["category" => "blue", "price" => 85]

Hope you can give me some ideas. Thank you.

Reply content:

Run the following code:

$ Arr = [0 => ["category" => "red", "price" => 95], 1 => ["category" => "blue ", "price" => 85], 2 => ["category" => "red", "price" => 75]; // I want to classify the preceding data as the following array ["red" => [0 => ["category" => "red", "price" => 95], 1 => ["category" => "red", "price" => 75], "blue" => [0 => ["category" => "blue", "price" => 85]

Hope you can give me some ideas. Thank you.

   [            "category" => "red",            "price" => 95        ],        1 => [            "category" => "blue",            "price" => 85        ],            2 => [            "category" => "red",            "price" => 75        ]    ];$result = array();foreach($arr as $k=>$v){    //var_dump($v);    //echo $v['price'];    $key = $v['category'];    if(!array_key_exists($key, $result)) $result[$key] =array();    $result[$key][] = $v;}var_dump($result);

function group_same_key($arr,$key){    $new_arr = array();    foreach($arr as $k=>$v ){        $new_arr[$v[$key]][] = $v;    }    return $new_arr;}