Overview
KB
Technical FAQ
PHP Manual
CSS2 Manual
HTML Manual
JS Guide
JS Reference
PhpDock Manual
Nu-Coder Manual
PhpExpress Manual
PHP Joomla
Development
Learn PHP
 
<inflate_initreadgzfile>
^Zlib FunctionsLast updated: Mon, 26 Oct 2026

ob_gzhandler

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

ob_gzhandler — ob_start callback function to gzip output buffer

Description

function ob_gzhandler(string $data, int $flags): string|false

ob_gzhandler() is intended to be used as a callback function for ob_start() to help facilitate sending gz-encoded data to web browsers that support compressed web pages. Before ob_gzhandler() actually sends compressed data, it determines what type of content encoding the browser will accept ("gzip", "deflate" or none at all) and will return its output accordingly. All browsers are supported since it's up to the browser to send the correct header saying that it accepts compressed web pages. If a browser doesn't support compressed pages this function returns false.

Parameters

data

flags

Return Values

Examples

Example #1 ob_gzhandler() example

<?php

ob_start("ob_gzhandler");

?>
<html>
<body>
<p>This should be a compressed page.</p>
</body>
</html>

Notes

Note:

ob_gzhandler() requires the zlib extension.

Note:

You cannot use both ob_gzhandler() and zlib.output_compression. Also note that using zlib.output_compression is preferred over ob_gzhandler().

See Also

  • ob_start() - Turn on output buffering
  • ob_end_flush() - Flush (send) the return value of the active output handler and turn the active output buffer off


<inflate_initreadgzfile>
^Zlib FunctionsLast updated: Mon, 26 Oct 2026