Prevent Too Many Request From a Client using PHP

In certain scenarios, we might need to make sure that a client is not allowed to request a page for multiple number of times within a period of time.

The following sample PHP code exits the execution when a client requests the same page more than once within 2 seconds. We can easily change the threshold value of 2 seconds as per our requirement.

This might prove to be pretty useful when the webpage is heavy and resourceful.

Full Source Code :

<style>
.centered{
  width:50%;
  margin:0 auto;
  font-size:19px;
  margin-top:20px;
}
</style>
<?php 
  if (!isset($_SESSION)) {
    session_start();
  }
  if(@$_SESSION['last_request'] > time() - 2){
    echo '<div class="centered"><strong>TOO MANY REQUESTS</strong> <hr><p><em>You are allowed a request every 2 seconds.</em></p></div>';
      exit;
  }
  $_SESSION['last_request'] = time();
?>
<div class="centered">
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   <hr>
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</div>

Follow this video for complete guidance :