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@ 2019-12-09T13:58:23Z

<?php

$allTags = [
            0 =>  [
                "name" => "TAG-ONE",
                "video" => "64070,64076,64110,64111",
            ],
            1 => [
                "name" => "TAG-TWO",
                "video" => "64070,64076,64110,64111",
            ],
            2 => [
                "name" => "TAG-THREE",
                "video" => "64111",
            ]
        ];

$video_ids = array_flip(array_unique(explode(",",implode(",",array_column($allTags,'video')))));

$result = array_map(function($id){
    return ['name' => '','video' => $id];
},array_flip($video_ids));

array_walk($allTags,function($tag_data) use (&$result,&$video_ids){
    $ids = explode(",",$tag_data['video']);
    foreach($ids as $id) $result[$video_ids[$id]]['name'] = empty($result[$video_ids[$id]]['name']) ? $tag_data['name'] : $result[$video_ids[$id]]['name'] . "," . $tag_data['name'];
});

print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [name] => TAG-ONE,TAG-TWO [video] => 64070 ) [1] => Array ( [name] => TAG-ONE,TAG-TWO [video] => 64076 ) [2] => Array ( [name] => TAG-ONE,TAG-TWO [video] => 64110 ) [3] => Array ( [name] => TAG-ONE,TAG-TWO,TAG-THREE [video] => 64111 ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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