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@ 2024-10-23T08:04:51Z

<?php

$array = [
    [
        'key_1' => 'FOO',
        'key_2' => 'FTU-1',
        'cats' => '/30/'
    ],
    [
        'key_1' => 'FOO',
        'key_2' => 'FTU-2',
        'cats' => '/30/'
    ],
    [
        'key_1' => 'FOO',
        'key_2' => 'FTU-3',
        'cats' => '/30/10/'
    ],
    [
        'key_1' => 'FOO',
        'key_2' => 'FTU-4',
        'cats' => '/15/'
    ],
    [
        'key_1' => 'FOO',
        'key_2' => 'FTU-5',
        'cats' => '/10/'
    ],
    [
        'key_1' => 'FOO',
        'key_2' => 'FTU-6',
        'cats' => '/15/'
    ],
];

$result = [];
foreach ($array as $row) {
    $cats = preg_split('#/#', $row['cats'], 0, PREG_SPLIT_NO_EMPTY); 
    foreach ($cats as $cat) {
        $result[$cat][] = $row;
    }
}
var_export($result);

Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: array ( 30 => array ( 0 => array ( 'key_1' => 'FOO', 'key_2' => 'FTU-1', 'cats' => '/30/', ), 1 => array ( 'key_1' => 'FOO', 'key_2' => 'FTU-2', 'cats' => '/30/', ), 2 => array ( 'key_1' => 'FOO', 'key_2' => 'FTU-3', 'cats' => '/30/10/', ), ), 10 => array ( 0 => array ( 'key_1' => 'FOO', 'key_2' => 'FTU-3', 'cats' => '/30/10/', ), 1 => array ( 'key_1' => 'FOO', 'key_2' => 'FTU-5', 'cats' => '/10/', ), ), 15 => array ( 0 => array ( 'key_1' => 'FOO', 'key_2' => 'FTU-4', 'cats' => '/15/', ), 1 => array ( 'key_1' => 'FOO', 'key_2' => 'FTU-6', 'cats' => '/15/', ), ), )

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