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.
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.No | Parameters & 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.
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