php - How to check if a site has rss feeds -

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Suppose I would like to create a webpage that takes the domain name of a website as input and checks if the site has RSS feeds or not. . And if that site has RSS feeds, then it goes to the next page or in other words, just check whether the given domain name has this tag or not- 
  & lt ; Link rel = "alternate" type = "application / rss + xml" title = "something" Href = "http: //www.example.com/feed1.xml?type=/   
 How do I do this by using php or javascript?   
 
 
 Because of, you do not implement javascript You will need PHP,   and Xpath  html> gtc: head> gt; [@ rel = 'optional'] .   < Search for / html>

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