The difference between double quotes and single quotes in PHP

Double quotes will let the program be checked for variables that are not

When you use a variable, you can compile it with double quotes before you can replace it with a variable value.



There are also n and so to be double quotes, with single quotes directly output n

and single quotes will show the program directly.

The characteristics of single quotes, save time, the compiler will not take it as a variable to translate OH

It is recommended that you use single quotes without variables.

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