I was working a lot with PHP 4, with PHP5 I work for not very long time. For now the most disappointing thing in PHP 5 is scope resolution problem. It is described in ian at [first name]henderson dot org comment:

Please note that methods called by the scope resolution operator which are defined by a superclass of the first operand are called in the scope of the SUPERCLASS. For example,

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<?php   class ExampleSuperclass { static function classType() { return "superclass"; }   static function doSomething() { echo "doing something with " . self::classType(); } }   class ExampleClass extends ExampleSuperclass { static function classType() { return "subclass"; } }   ExampleClass::doSomething(); // output is "doing something with superclass"!   ?>

This can be surprising (it surprised me!) when coming from other object-oriented languages, which would output “doing something with subclass” in this case.

The answer was:

The functionality you’ve expected maybe will be possible in PHP6….

That’s pity.