Subtle oop differences between java and php

[pylon]

I found this case** php example ** \[code\]abstract class class1{ function test(){} }abstract class class2 extends class1{ abstract function test(); } \[/code\]This oop concept works in Java, in PHP it doesn't.(\[code\]Cannot make non abstract method class1::test() abstract in class class2\[/code\])What other subtle differences there are between Java and PHP oop ?