CODEWITHSUNDEEP
phpvariable-variables
mseancole
mseancole

Reputation: 1672

PHP $_GET/$_POST via variable variables

I'm attempting to dynamically access both the $_GET and $_POST arrays, among others, using variable variables. The reason I'm trying to do this is so that I can perform similar actions on multiple arrays without needing to declare specific iterations for each. I'm reasonably sure this is possible, as PHP's documentation says it is able to use variable variables to dynamically access an array, however I'm unable to get it to work. A simple demonstration is when I'm attempting to verify that a certain property has been set.

if(isset(${$this->_array}[$property])) { return ${$this->_array}[$property]; }
else { return null; }

When I run the above script I always get null, however when I statically seek the desired property, manually using $_GET or $_POST, I get the desired outcome. I have triple checked $this->_array and $property and they are returning the correct string values. Are these arrays unavailable for such access, or am I doing something wrong?

Upvotes: 4

Views: 1019

Answers (7)

Barmar
Barmar

Reputation: 780994

You can create an associative array that references both arrays, and use that.

$params = [
    '_GET' => $_GET,
    '_POST' => $_POST
];

Then you can use

return $params[$this->_array][$property] ?? null;

Upvotes: 0

pelister
pelister

Reputation: 79

you can do this but dont know if it is a good coding practice

if( $_SERVER['REQUEST_METHOD'] == 'POST' ) {
     $method = '_POST';
 }
 else {
    $method = '_GET';
 }
 $data = $$method;

Upvotes: 0

jasonlfunk
jasonlfunk

Reputation: 5249

Superglobals cannot be referenced as variable variables inside of classes or methods, so this will work:

<?php
$var = "_GET";
print_r(${$var});

But this will not:

<?php
test();
function test() {
  $var = "_GET";
  print_r(${$var});
}

I suspect that there is a better way to do what you are trying to accomplish.

http://php.net/manual/en/language.variables.superglobals.php#refsect1-language.variables.superglobals-notes

Upvotes: 4

cHao
cHao

Reputation: 86505

Superglobals (such as $_POST) can not be used as variable variables within functions.

You could say something like $post = $_POST; and then use 'post' and it'd work, but directly using '_POST' won't.

Upvotes: 7

Cyclone
Cyclone

Reputation: 18295

Whatever you're doing wrong, using variable variables is probably making it worse. For your own sanity, please stop. They should never be deployed in production code under any circumstances. They're impossible to debug, and using them in your code is like trying to read something that someone else wrote with their feet. If they have particularly dexterous feet, then perhaps you can understand what they're doing. But 99.9999% of the time, it is better to just use normal arrays.

That being said, try $_REQUEST instead.

Upvotes: 3

kitti
kitti

Reputation: 14814

You say you want to access both the $_GET and $_POST arrays, among others -- what are these 'others'? You can use $_REQUEST to check the contents of $_GET, $_POST, and $_COOKIE all at once.

Upvotes: 0

Powerlord
Powerlord

Reputation: 88796

There's already an array that contains both $_GET and $_POST. It's named $_REQUEST. Having said that, it can also contain the contents of $_COOKIE depending on the request_order setting, but the default is just $_GET and $_POST.

Upvotes: 2

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