The 100 Most Common PHP Functions

The purpose of this page is to demonstrate
the most common PHP functions used by professional
PHP programmers. This page analyzes some popular
frameworks and CMS code (Drupal, codeIgniter,
cakePHP, Wordpress, and Moodle) and one large
custom application.

This page ignores the custom functions in these packages. This exercise is intended to catalog the built-in PHP functions that students should become adept at using.

Note that the custom application is heavily DB-centric. If you are learning PHP with an eye towards working at a startup, you should make sure that your database skills are ever so keen.