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Ok fine, I'm not a Texan.
But if you, like me, have ever needed a Drupal View's contextual filters to be combined with an "or" operator, you have probably been vexed.
If you run a website based on PHP, and have your source files on a network file system like NFS, OCFS2, or GlusterFS, and combine it with PHP's open_basedir protection, you'll quickly notice that the performance will degrade substantially. If you want to isolate your websites from each other (or from the rest of the operating system), how can you retain any shred of performance?
Callbacks! Every fancy jQuery plugin has them
and they are almost always specified along with all the other parameters when the plugin is initialized.
There are 2 kinds of people in this world: people who use the Migrate module to migrate content into a new Drupal site, and wrong people.
This post assumes a basic familiarity with the module.