Input string echo links

I am trying to come up with an app that will allow a user that will store multiple urls.

I am trying to write it in PHP. Does anyone have any examples that are similar to what I am trying to develop?

Any help is appreciated.

Input a string of text and display the output have the string displayed when page refreshes.

Here is what I am trying to do - Save the links display the result below the form and input

<!doctype html>
<meta charset="UTF-8">
<title>Saving multiple Links</title>
<form action='' method='POST'>
  <input type='text' name='save_link'>
  <input type='submit' name='submit_button' value='Submit'>