The Internet is Full of Nonsense

A small selection of PHP optimisation tips I found on the internet

echo is faster than print

Use pre-incrementing where possible as it is 10% faster

Methods in derived classes run faster than ones defined in the base class.

A function call with one parameter and an empty function body takes about the same time as doing 7-8 $localvar++ operations. A similar method call is of course about 15 $localvar++ operations.

Not everything has to be OOP, often it is just overhead, each method and object call consumes a lot of memory.

Avoid overusing function calls. Calling a function in PHP is very expensive, so avoid it whenever you can.