What are the syntax differences in Java which a PHP programmer should be aware of?

I am more practiced in PHP than in Java, and when I use Java I find myself looking at it from a PHP perspective. This can cause trouble, so I'd like to know, the syntax differences between Java a开发者_JAVA技巧nd PHP?

Well this has been moved to here. https://softwareengineering.stackexchange.com/questions/38439/what-are-the-most-common-programming-mistakes-php-programmers-make-in-java