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@ 2022-10-21T15:36:39Z

<?php

$array = array(
    '217.192' => array(
        array(
            'ip' => '217.192.133.52',
            'id' => '1',
        ),
        array(
            'ip' => '217.192.98.111',
            'id' => '2',
        ),
    ),
    '21.170' => array(
        array(
            'ip' => '21.170.171.23',
            'id' => '3',
        ),
        array(
            'ip' => '21.170.212.22',
            'id' => '4',
        ),
    ),
    '148.11' => array(
        array(
            'ip' => '148.11.11.12',
            'id' => '5',
        ),
        array(
            'ip' => '148.11.122.33',
            'id' => '6',
        ),
        array(
            'ip' => '148.11.22.89',
            'id' => '7',
        ),
    ),
    '72.1' => array(
        array(
            'ip' => '72.1.98.9',
            'id' => '8',
        ),
    ),
);

array_multisort(
    array_map('count', $array), // rule 1
    SORT_DESC,                  // rule 1 direction
    array_keys($array),         // rule 2
    $array                      // affect original array
);
var_export($array);

Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: array ( '148.11' => array ( 0 => array ( 'ip' => '148.11.11.12', 'id' => '5', ), 1 => array ( 'ip' => '148.11.122.33', 'id' => '6', ), 2 => array ( 'ip' => '148.11.22.89', 'id' => '7', ), ), '21.170' => array ( 0 => array ( 'ip' => '21.170.171.23', 'id' => '3', ), 1 => array ( 'ip' => '21.170.212.22', 'id' => '4', ), ), '217.192' => array ( 0 => array ( 'ip' => '217.192.133.52', 'id' => '1', ), 1 => array ( 'ip' => '217.192.98.111', 'id' => '2', ), ), '72.1' => array ( 0 => array ( 'ip' => '72.1.98.9', 'id' => '8', ), ), )

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