在$ _POST变量中使用引号，撇号或不使用引号和撇号有什么区别? [英] What is the difference in using quotes, apostrophes or neither in $_POST variables?

问题描述

我最近发布了一个问题，其中的代码无效，并建议我在$ _POST变量中添加撇号.

I recently posted a question in which the code did not work, and was suggested i add apostrophes to my $_POST variables.

$_POST[variable]

推荐人(?)

$_POST['variable']

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$_POST["variable"]

您使用什么，为什么?
使用其他之一会产生什么区别?

What do you use, and why?
What differences arise when using one of the others?

推荐答案

使用"和'之间没有实质性区别.数组键可以是整数或字符串.字符串用PHP引用.在这种情况下，不使用引号是可行的，但是PHP首先会检查键是否为常量，然后再将其解释为字符串.不引用数组键是 PHP文档中不推荐的.

There is no substantial difference between using " and '. Array keys can be either integers or strings. Strings are quoted in PHP. Not using quotes in this case works, but PHP checks if the key is a constant first, then falling back on interpreting it as a string. Not quoting array keys is discouraged in the PHP documentation.

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