We now have a youtube channel. Subscribe!

PHP | header_register_callback() Function

PHP header_register_callback() Function


Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP header_register_callback() Function.

The built-in PHP header_register_callback() function registers the function that will be called when PHP start sending output.

Syntax

Following below is the syntax to use this function -

bool header_register_callback ( callable $callback )


Parameter Details

Sr.NoParameters & Description
1

callback

It called before the headers are sent.


Return Value

This PHP function returns true on success and false on failure.

Example

Try out the following example below -

<?php
   header('Content-Type: text/plain');
   header('X-Test: f1');
   
   function f1() {
      foreach (headers_list() as $header) {
         
         if (strpos($header, 'X-Powered-By:') !== false) {
            header_remove('X-Powered-By');
         }
         header_remove('X-Test');
      }
   }
   
   $result = header_register_callback('f1');
   
   echo "webdesigntutorialz";
?>

Output

When the above code is executed, it will produce the following result below -

webdesigntutorialz


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we will study about the PHP header_remove() Function.

Do feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

Do follow us on our various social media handles available and also subscribe to our newsletter to get our tutorial posts delivered directly to your emails.

Thanks for reading and bye for now.

Post a Comment

Hello dear readers! Please kindly try your best to make sure your comments comply with our comment policy guidelines. You can visit our comment policy page to view these guidelines which are clearly stated. Thank you.
© 2023 ‧ WebDesignTutorialz. All rights reserved. Developed by Jago Desain