Default value of member variables

Question

What is the default value of class member variables in PHP?

Why do I often see:

public static $variable = null;

Wouldn\'t it be eno

Answer 1

It would, but some people either don't know that, or prefer to be explicit.

A common convention is to initialize to null when the programmer relies on that null value and do not initialize to null if that member is written to before being read.