WebReference.com has a new tutorial that looks at the difference sorts of operators that PHP has to offer - unary, binary and ternary - to help you with the logic in your applications.

An operator is a special character or combination of characters that operates on variables. There are 3 types of operators in PHP: unary, binary and ternary. They can be used to manipulate a variable with up to 3 arguments at a time. This article wasn't written to discuss the meaning and usage of each operator in PHP, but rather to explain the differences between these types of operators and to give examples about how each functions.

They look at the different types of operators (and include examples for each) - unary (like ! or ++), binary (things like + / == and &&) and a special case - ternary. This uses two characters in conjunction (the question mark and colon) to replace a simple sort of If statement.