Variable _POST or _GET

Dev Shed Forums Sponsor:

January 18th, 2013, 11:28 AM

WrinkledCheese

Contributing User

Join Date: Jun 2011

Posts: 138

Time spent in forums: 1 Day 16 h 13 m 36 sec
Reputation Power: 96

Variable _POST or _GET

Hello everyone,

I'm mostly curious why this code doesn't work 100%.

http://192.168.1.100/test.php?variable=value

PHP Code:

Original - PHP Code
$test = "some text to test with"; $print = "test"; echo $$print; $dataLocation = "_GET"; $keys = array_keys($$dataLocation); foreach($_GET as $k => $v){ echo $k . " => " . $v . "<br>"; }

$test = "some text to test with";
$print = "test";
echo $$print;
$dataLocation = "_GET";
$keys = array_keys($$dataLocation);
foreach($_GET as $k => $v){
  echo $k . " => " . $v . "<br>";
}

Code:

Results

some text to test with
Notice: Undefined variable: _GET in test.php on line 5
variable => value

January 18th, 2013, 11:56 AM

requinix

Still alive

Join Date: Mar 2007

Location: Washington, USA

Posts: 12,679

Folding Points: 417516 Folding Title: Super Ultimate Folder - Level 1

Time spent in forums: 5 Months 1 Week 4 Days 1 h 46 m 33 sec
Reputation Power: 8969

Send a message via Google Talk to requinix

auto_globals_jit. When PHP reads your code it sees references to $_GET and $_SESSION and such and makes sure they're available. Since you try to use one before you explicitly mention it there's no guarantee it will actually exist.

Try this.

PHP Code:


		
			
// you don't even have to use it

$_GET;



$test = "some text to test with";

$print = "test";

echo $$print;

$dataLocation = "_GET";

$keys = array_keys($$dataLocation);

foreach($_GET as $k => $v){

  echo $k . " => " . $v . "<br>";

}

Comments on this post

ManiacDan agrees!

__________________
Site rules and FAQ | Project Suggestions | mod_rewrite guide | PHP New User Guide and FAQ - PHP Stickies | Regex Resources

January 18th, 2013, 12:28 PM

WrinkledCheese

Contributing User

Join Date: Jun 2011

Posts: 138

Time spent in forums: 1 Day 16 h 13 m 36 sec
Reputation Power: 96

Unfortunately this quick fix didn't work, but at least I know why it's happening, I think.

I went so far as to do this at the top of my script:

PHP Code:

Original - PHP Code
$_GET['init'] = 'JIT INIT';

$_GET['init'] = 'JIT INIT';

I've also tried:

PHP Code:

Original - PHP Code
ini_set('auto_globals_jit', 'Off');

ini_set('auto_globals_jit', 'Off');

As well as going into the php.ini file turning it off there and restarting the server. No difference. I also have a var_dump($_GET); and that shows that there is stuff in the $_GET array.

Last edited by WrinkledCheese : January 18th, 2013 at 12:39 PM.

January 18th, 2013, 12:45 PM

ManiacDan

Likely to be eaten by a grue.

Dev Shed God 10th Plane (9500 - 9999 posts)

Join Date: Oct 2006

Location: Pennsylvania, USA

Posts: 9,791

Folding Points: 127430 Folding Title: Super Ultimate Folder - Level 1

Time spent in forums: 2 Months 3 Weeks 14 h 53 m 20 sec
Reputation Power: 6112

From the manual

Quote:

Originally Posted by RTFM Requinix

Please note that variable variables cannot be used with PHP's Superglobal arrays within functions or class methods. The variable $this is also a special variable that cannot be referenced dynamically.

Comments on this post

WrinkledCheese agrees: This is my issue. Thanks! 96 points for your....collection

__________________
HEY! YOU! Read the New User Guide and Forum Rules

"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin

"The greatest tragedy of this changing society is that people who never knew what it was like before will simply assume that this is the way things are supposed to be." -2600 Magazine, Fall 2002

Think we're being rude? Maybe you asked a bad question or you're a Help Vampire. Trying to argue intelligently? Please read this.

January 18th, 2013, 12:47 PM

requinix

Still alive

Join Date: Mar 2007

Location: Washington, USA

Posts: 12,679

Time spent in forums: 5 Months 1 Week 4 Days 1 h 46 m 33 sec
Reputation Power: 8969

You can't ini_set() it on - it's too late in the process.

What's the exact script you're using to reproduce this problem? Does it involve classes or functions like Dan pointed out?

January 21st, 2013, 07:41 AM

WrinkledCheese

Contributing User

Join Date: Jun 2011

Posts: 138

Time spent in forums: 1 Day 16 h 13 m 36 sec
Reputation Power: 96

Quote:

Originally Posted by requinix

You can't ini_set() it on - it's too late in the process.

What's the exact script you're using to reproduce this problem? Does it involve classes or functions like Dan pointed out?

It is in a function.

Variable _POST or _GET

Developer Shed Advertisers and Affiliates