PHP

Variables

• Primitives
• Strings
• Arrays
• References
• Converting data types
• Misc

Language

• Operators
• Boolean expressions
• Conditionals
• Loops
• Functions
• OOP
• Comments

Misc

• PHP style
• Misc

Input / output

• Standard input / output
• File access

Advanced

• XML
• Cookies
• User sessions

Programs

• CGI
• Scripts

Databases

• MySQL