Post Link : http://www.skptricks.com/2017/12/extract-url-data-like-facebook-and-web-scraping.html
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This post explains how to create Extract URL Data Like Facebook Using PHP, jQuery and Ajax. Basically in the URL Extraction we are retrieving the Meta Tag details from the webpages, which is available in the Head Tag.

From the Meta Tag we are picking up some important information like Title, Description, Images and some URL. If you have observed the most the company like Facebook, Twitter, Google, LinkedIn etc using this link extraction technique in their webpages. In another word this extraction technique is also called as web scraping.

What is web scraping ?
Web Scraping refers to an application that processes the HTML of a Web page to extract data for manipulation such as converting the Web page to another format (i.e. HTML to WML).

Here in this post we have provided simple example to Extract URL Data and also it gives you ideas how to get the cross domain data with jquery and ajax.
extract url in php Technical Guruji

lets see the below source code and clear you understanding step by step.
Post Link : http://www.skptricks.com/2017/12/extract-url-data-like-facebook-and-web-scraping.html
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https://www.youtube.com/watch?v=Zjh1ahyHwMA

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Web scraping is a very powerful technique. It is the most powerful application of programming I have tasted.
Nice topic.