fork download 
  1. <?php
  2.  
  3. $string = array('http://y...content-available-to-author-only...e.com/watch?v=slBEtqC_JsI', 'https://y...content-available-to-author-only...u.be/bOxza0rLv1o', 'http://y...content-available-to-author-only...e.com/watch?v=slBEtqC_JSJ/');
  4. $search = '~(?:https?://(?:www\.)?youtu(?:be\.com/watch\?v=|\.be/))?([a-zA-Z0-9_+?:-]+)/?~';
  5. $replace = 'https://i...content-available-to-author-only...g.com/vi/$1/hqdefault.jpg';   
  6. $soc_youtube = preg_replace($search,$replace,$string);
  7. print_r($soc_youtube);
Success #stdin #stdout 0s 82944KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [0] => https://i...content-available-to-author-only...g.com/vi/slBEtqC_JsI/hqdefault.jpg
    [1] => https://i...content-available-to-author-only...g.com/vi/bOxza0rLv1o/hqdefault.jpg
    [2] => https://i...content-available-to-author-only...g.com/vi/slBEtqC_JSJ/hqdefault.jpg
)
https://ideone.com/zUcra2
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
secret

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