PHP compression is an excellent method of conserving bandwidth and reducing client download times. We have already discussed an excellent method for CSS compression, and in this article we share a super-easy technique for compressing all PHP content without editing a single file.
Using two PHP files and two corresponding lines of .htaccess, it is possible to compress your PHP files via gzip-encoding. Browsers and other user-agents capable of interpreting gz-encoded data will employ the compressed content, while other user-agents will utilize the content uncompressed.
Before we begin, it is important to determine if your server employs output buffering. If so, it may not be necessary to compress content via this method. Also, this PHP compression technique requires PHP version 4.0.5 or better.
First, create two PHP files,
gzip_start.php and add this code:
<?php ob_start("ob_gzhandler"); ?>
gzip_stop.php and add this:
<?php ob_flush(); ?>
Save and upload both files to a convenient location on your server. The first file instructs the server to begin output buffering via gz-encoding. The second file instructs the server to transmit the buffered content to the user-agent, assuming it sends a header indicating its ability to process gzipped data.
Finally, we need a way to include first file at the beginning of each PHP document and the second file at the end of each PHP document. Rather than manually adding
require() functions to every PHP document, we will summon the mysterious powers of
.htaccess to do it all automatically. Simply add the following lines to your
# dual file includes for PHP compression
php_value auto_prepend_file /specify/full/path/to/gzip_start.php
php_value auto_append_file /specify/full/path/to/gzip_stop.php
Edit the path in each line, save and upload the
.htaccess file to your server. These two lines will ensure proper inclusion of both files to every PHP document subject to their influence (i.e., the containing directory and all subdirectories). The
auto_prepend_file function literally prepends data, while the
auto_append_file function, well, you get the idea..
For an even easier PHP-compression method, simply place the following code before the (X)HTML content in any PHP script:
<?php if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) ob_start("ob_gzhandler"); else ob_start(); ?>
In this case, the
ob_flush() command is unnecessary as PHP inherently flushes the buffer. The script delivers gzipped content to capable browsers and uncompressed content to incapable browsers. It’s a win-win!