'和'之间的区别 [英] difference between ' and "

问题描述

今天我花了几个小时寻找一个bug，直到我终于发现问题如下：


正确：$ path_upload =" $ path / $ file";


而不是：


错误：$ path_upload =''$ path / $ file '';


注意引号的差异。由于我一直在用
PHP进行编程，我发现''和'之间的区别很小，

但有人可以解释我，何时到使用''以及何时使用'b $ b使用'。如果有人向我解释这个

会非常棒！


谢谢，

Jochem

Today I spent a couple of hours searching for a bug, until I finally
found out that the problems was the following:

Correct: $path_upload = "$path/$file";

Instead of:

Wrong: $path_upload = ''$path/$file'';

Note a difference in quotation marks. Since I have been programming in
PHP I found out that there is very little difference between '' and ",
but is there somebody who can explain me, when to use '' and when to
use ". It would be really great if there is somebody to explain this
to me!

Thanks,
Jochem

推荐答案

path_upload ="

path_upload = "

path /

file" ;;


而不是：


错误：

file";

Instead of:

Wrong:

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