$this in PHP5
In PHP4 anything can be assigned to the variable $this. But not anymore in PHP5.
Here is a code snipped from dracko
Works fine in PHP4, and PHP5 stops with a fatal error: "Using $this when not in object context".
Ways to fix: rewrite your code to use another variable name than ‘this’ such as $_this.
When you call a static function in a Php class, it has the side-effect of wiping out the class context. Without the class context, you canâ€™t make other calls to class members. In my case above, Php allowed me to break the class context (calling a non-static as static) without warning, which caused a perfectly legitimate class member function fail:
Instead, Php should warn: Calling a non-static member as static. This might not be what you meant to do.