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A little while back I needed to split a large Apache log file (3.5GB) up into smaller pieces and wanted to break it up into several files, with one for each day of the month. I initially tried using "grep" on the command line but this proved to be too slow, and I needed to run it once for each day and month so it was going to take 92 times to run, extracting just one day at a time over the course of three months. I ended up writing a quick little PHP script which was able to split the 3.5GB file into 92 files, one for each day of each month in under 4 minutes.

If you get the following error message in PHP then it means you need to have the PHP GD extension installed. Obviously the /path/to/file.php will be the actual path and filename of the PHP script the error occured in, and the line number will be the actual line.

Fatal error: Call to undefined function ImageCreateFromPNG() 
  in /path/to/file.php on line 379

You’ll also get this error message using other functions such as ImageCreateFromJPEG() if the PHP GD library is not installed.

APC is the Alternative PHP Cache, which is a free, open, and robust framework for caching and optimizing PHP intermediate code. What this means is that APC reads your PHP files, parses them into a more efficient binary format and then caches them in memory so that each request for your PHP files and PHP library files can be fed from the parsed cache. This will generally lead to a speed increase when serving a PHP site, especially one with a lot of library files. This post looks at how to install APC for PHP on Linux. The Linux distribution I used was CentOS 5, but it should be fairly similar for most distros.