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@ 2022-09-19T23:28:00Z

<?php

$columns=[
  'id',
  'snippet'=>[
   'publishedAt',
   'channelId',
   'channelTitle',
   'description',
   'thumbnails'=>[
    'default'=>['url','width','height'],
    'medium'=>['url','width','height'],
    'high'=>['url','width','height'],
    'standard'=>['url','width','height'],
    'maxres'=>['url','width','height']
   ],
   'tags',
   'categoryId'
  ],
  'status'=>[
   'uploadStatus',
   'privacyStatus',
   'license',
   'embeddable',
   'publicStatsViewable',
   'madeForKids'
  ],
  'statistics'=>[
   'viewCount',
   'likeCount',
   'favoriteCount',
   'commentCount'
  ]
 ];
 
 
 function simplify($columns, $root = '')
 {
    $output = []; 
    foreach ($columns as $key => $value) {
        if (is_array($value)) {
            $output = array_merge($output, simplify($value, $root . $key . '-'));
        } else {
            $output[$root . $value] = 1; 
        }
    }
    return $output;
 }
 
 var_export(simplify($columns));

Output for rfc.property-hooks, git.master, git.master_jit: array ( 'id' => 1, 'snippet-publishedAt' => 1, 'snippet-channelId' => 1, 'snippet-channelTitle' => 1, 'snippet-description' => 1, 'snippet-thumbnails-default-url' => 1, 'snippet-thumbnails-default-width' => 1, 'snippet-thumbnails-default-height' => 1, 'snippet-thumbnails-medium-url' => 1, 'snippet-thumbnails-medium-width' => 1, 'snippet-thumbnails-medium-height' => 1, 'snippet-thumbnails-high-url' => 1, 'snippet-thumbnails-high-width' => 1, 'snippet-thumbnails-high-height' => 1, 'snippet-thumbnails-standard-url' => 1, 'snippet-thumbnails-standard-width' => 1, 'snippet-thumbnails-standard-height' => 1, 'snippet-thumbnails-maxres-url' => 1, 'snippet-thumbnails-maxres-width' => 1, 'snippet-thumbnails-maxres-height' => 1, 'snippet-tags' => 1, 'snippet-categoryId' => 1, 'status-uploadStatus' => 1, 'status-privacyStatus' => 1, 'status-license' => 1, 'status-embeddable' => 1, 'status-publicStatsViewable' => 1, 'status-madeForKids' => 1, 'statistics-viewCount' => 1, 'statistics-likeCount' => 1, 'statistics-favoriteCount' => 1, 'statistics-commentCount' => 1, )

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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2016-08-14 Arrow functions - withdrawn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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