什么时候应该不用引号？什么时候用单引号？什么时候用双引号啊？

Question

如题

Answer 1

When should you use quotation marks? When to use single quotes? When do you use double quotes? -PHP Chinese website Q&A-When should quotation marks be used? When to use single quotes? When do you use double quotes? -PHP Chinese website Q&A

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Answer 2

一般来说单引号和双引号没什么区别，比较建议使用单引号，速度会快一些.

引号代表里面的内容是字符串，如果是变量之类的就不需要用引号了.