In this tutorial, I will show how you can use PHP to read RSS feeds of the websites and showing recent post lists using it.
RSS (Rich Site Summary) is a format which is used in many websites which allow web publisher to syndicates their latest posts or data automatically. It also benefits people who want to receive the latest posts updates from their favorite websites.
There is another method that allows the user to stay updated is bookmarking. But they need to manually go to websites on a timely basis and check what new have been added.

1. HTML and PHP

Using simplexml_load_file() method to read XML which takes URL as a parameter and return an Object after interpreting the XML.
Loop over the Object to get content.

Completed Code

<div class="content">

 <form method="post" action="">
  <input type="text" name="feedurl" placeholder="Enter website feed URL">&nbsp;<input type="submit" value="Submit" name="submit">
 </form>
 <?php

 $url = "https://makitweb.com/feed/";
 if(isset($_POST['submit'])){
   if($_POST['feedurl'] != ''){
     $url = $_POST['feedurl'];
   }
 }

 $invalidurl = false;
 if(@simplexml_load_file($url)){
  $feeds = simplexml_load_file($url);
 }else{
  $invalidurl = true;
  echo "<h2>Invalid RSS feed URL.</h2>";
 }


 $i=0;
 if(!empty($feeds)){

  $site = $feeds->channel->title;
  $sitelink = $feeds->channel->link;

  echo "<h1>".$site."</h1>";
  foreach ($feeds->channel->item as $item) {

   $title = $item->title;
   $link = $item->link;
   $description = $item->description;
   $postDate = $item->pubDate;
   $pubDate = date('D, d M Y',strtotime($postDate));


   if($i>=5) break;
  ?>
   <div class="post">
     <div class="post-head">
       <h2><a class="feed_title" href="<?php echo $link; ?>"><?php echo $title; ?></a></h2>
       <span><?php echo $pubDate; ?></span>
     </div>
     <div class="post-content">
       <?php echo implode(' ', array_slice(explode(' ', $description), 0, 20)) . "..."; ?> <a href="<?php echo $link; ?>">Read more</a>
     </div>
   </div>

   <?php
    $i++;
   }
 }else{
   if(!$invalidurl){
     echo "<h2>No item found</h2>";
   }
 }
 ?>
</div>

2. CSS

 

.content{
    width: 60%;
    margin: 0 auto;
}

input[type=text]{
    padding: 5px 10px;
    width: 60%;
    letter-spacing: 1px;
}

input[type=submit]{
    padding: 5px 15px;
    letter-spacing: 1px;
    border: 0;
    background: gold;
    color: white;
    font-weight: bold;
    font-size: 17px;
}

h1{
    border-bottom: 1px solid gray;
}

h2{
    color: black;
}
h2 a{
    color: black;
    text-decoration: none;
}

.post{
    border: 1px solid gray;
    padding: 5px;
    border-radius: 3px;
    margin-top: 15px;
}

.post-head span{
    font-size: 14px;
    color: gray;
    letter-spacing: 1px;
}

.post-content{
    font-size: 18px;
    color: black;
}

3. Conclusion

Use simplexml_load_file() method to read RSS feeds of the website. Within the method pass your feed URL.
Loop through the returned Object to read contents.

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