Is it possible to List Out All the Global variables in PHP?

Question

Is it possible to list out all the Global Variable. Such , as to print all session variable we can use print_r($_SESSION); as the same way, if i want to know how many Global variables are define in my site. is it possible? Please Help.

I need the list which can show me all the Global variables List in PHP.

score 39 · Accepted Answer · answered Sep 19 '12 at 04:40

39

Yes, PHP $GLOBALS array will show you.

<?php

echo "<pre>";
print_r($GLOBALS);
echo "</pre>";

answered Sep 19 '12 at 04:40

Jordan Arsenault

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It doesn't work for me. It throws `500 server error`. Meanwhile `var_dump($GLOBALS);` works. (hook: 'shutdown') Anyone, any idea? Thanks – Viktor Borítás Dec 19 '21 at 21:22
Do you own the server? Your hosting company might block `print_r($GLOBALS)` for security reasons. – Jordan Arsenault Feb 02 '23 at 18:58

score 9 · Answer 2 · answered Sep 19 '12 at 04:40

9

To get names of all global variables do this:

array_keys($GLOBALS)

More docs:

on array_keys(): http://php.net/manual/en/function.array-keys.php
on $GLOBALS: http://php.net/manual/en/reserved.variables.globals.php

answered Sep 19 '12 at 04:40

Tadeck

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score 3 · Answer 3 · edited May 23 '17 at 11:53

3

$GLOBALS — References all variables available in global scope also check this PHP global or $GLOBALS here you find many important and useful thing about $GLOBALS

edited May 23 '17 at 11:53

Community

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answered Sep 19 '12 at 04:38

NullPoiиteя

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score 2 · Answer 4 · answered Sep 19 '12 at 04:38

2

The reserved $GLOBALS variable is an array containing all global variables.

In the array, the keys are variable names and the values are variable values.

answered Sep 19 '12 at 04:38

FThompson

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score 2 · Answer 5 · answered Sep 19 '12 at 04:40

2

Well, there does exist a $GLOBALS variable in PHP.

But you can't do a var_export() on it. It'll lead to an error like: Nesting level too deep - recursive dependency?

answered Sep 19 '12 at 04:40

hjpotter92

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If you **DO WANT** to have a [`var_export`](http://php.net/manual/en/function.var-export.php) then [check this](http://php.net/manual/en/function.var-export.php#100302) – hjpotter92 Sep 19 '12 at 07:28

Is it possible to List Out All the Global variables in PHP?

5 Answers5

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