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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 git.master_jit, git.master: 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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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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