get_defined_vars()

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

返回由所有已定义变量所组成的数组

描述

此函数返回一个包含所有已定义变量列表的多维数组，这些变量包括环境变量、服务器变量和用户定义的变量。

参见get_defined_functions()和get_defined_constants()。

dirty code sample:
print_r(compact(array_keys(get_defined_vars())));

A little gotcha to watch out for:
If you turn off RegisterGlobals and related, then use get_defined_vars(), you may see something like the following:

Notice that $_SERVER isn't there. It seems that php only loads the superglobal $_SERVER if it is used somewhere. You could do this:

And then $_SERVER will appear in both lists. I guess it's not really a gotcha, because nothing bad will happen either way, but it's an interesting curiosity nonetheless.

Reference variables are returned by reference (tested on PHP 5.5.11): 

Since get_defined_vars() only gets the variables at the point you call the function, there is a simple way to get the variables defined within the current scope. 

Here is a function which generates a debug report for display or email
using get_defined_vars. Great for getting a detailed snapshot without
relying on user input.

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