PHP查找最高键值的索引

Question

I have an array of arrays. I would like to find the index of the array of the highest key value Rating. For example in the below the array index would be 1.

Any help would be much appreciated.

 array:3 [
      0 => array:3 [
        "name" => "Nola - Roman Road"
        "rating" => 4.2
        "price_level" => 3
      ]
      1 => array:3 [
        "name" => "The Camel"
        "rating" => 4.6
        "price_level" => 2
      ]
      2 => array:3 [
        "name" => "The Dundee Arms"
        "rating" => 4
        "price_level" => 2
      ]

Answer 1

You can use a few of the array_... functions. First array_column() to extract the column used for the maximum values, then array_keys() to return all of the keys that match the maximum value (found using max($prices) )...

$data = [
    0 => [
        "name" => "Nola - Roman Road",
        "rating" => 4.2,
        "price_level" => 3
    ],
    1 => [
        "name" => "The Camel",
        "rating" => 4.6,
        "price_level" => 4
    ],
    2 => [
        "name" => "The Dundee Arms",
        "rating" => 4,
        "price_level" => 2
    ]];

$rating = array_column($data, "rating");
$index = array_keys($rating, max($rating));

print_r($index);

This prints out ...

Array
(
    [0] => 1
)

This will also work if several entries match the maximum value which may help.