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What is this?

This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.

Why is this?

It used to be hard to find questions about operators and other syntax tokens.¹
The main idea is to have links to existing questions on Stack Overflow, so it's easier for us to reference them, not to copy over content from …

PHP 7将于今年11月推出,它将引入Spaceship(<=>)运营商.它是什么以及它是如何工作的？

_{关于PHP运算符的一般参考问题,这个问题已经有了答案.}