php - Get all HTML comments on website with html simple dom -

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I have tried to get all the comments from a website ( and -> ), but without luck.

Here is my current code: Include 

  ('simple_html_dom.php'); $ Html = file_get_html ('url'); Foreach ($ html-> Mill ('comment') as $ element) $ element- & gt; Plain text;   
 Anyone have any suggestions on how to capture comments, at this time it is only giving me blank page  
 
 
 I do not know how to parse  regex  the HTML, but  & lt ;! - - (. *?) - & gt;  You can use the same  regex  to search and find comments ...

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