php中单引号与双引号有什么区别？

Answer 1

What is the difference between single quotes and double quotes in php? -PHP Chinese website Q&A-What is the difference between single quotes and double quotes in PHP? -PHP Chinese website Q&A

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Answer 2

双引号里面的字段会经过编译器解释，然后再当作HTML代码输出。
单引号里面的不进行解释，直接输出。