Variable Variables Question

[Shayna23]

Hi Everybody, I'm trying to simulate a "register globals = ON" environment with this:

 

foreach($_POST as $var=>$value){

${$var} = $value;

}

 

I just noticed that I can use the bracket-less "$$var = $value"  instead of "${$var} = $value." Did I just discover something really cool and easier to type? Or are there horrible pitfalls to the bracketless $$var. I wonder which is faster?

 

Sorry for asking such a basic (dumbo-style) question, but I couldn't google the answer because google strips out dollarsigns and brackets from my search LOL

[trq]

I'm trying to simulate a "register globals = ON" environment

Why the hell would you do that? Register globals is disabled by default for a reason. It has massive security implications.

[Shayna23]

Cute response

Edited January 8, 2014 by Shayna23

[Barand]

 

"Did I just discover something really cool and easier to type?

Afraid not. The manual beat you to it.

http://www.php.net/manual/en/language.variables.variable.php

[Shayna23]

Oh.

Edited January 8, 2014 by Shayna23

[requinix]

Plus variable variables won't work if you try to put arrays into your fields, such as with

[objnoob]

Plus variable variables won't work if you try to put arrays into your fields, such as with

<input type="text" name="array[]" />

 

Why not?

[requinix]

Because it'll try to create a variable named "array[]". With the brackets.

[objnoob]

Because it'll try to create a variable named "array[]". With the brackets.

 

I doubt it.

[objnoob]

It will create a variable name $array   and the value of this variable would be an array.  

I'm quite certain....

 

Ex:    

 

<input type='text' name='array[]' value='value 1' />

<input type='text' name='array[]' value='value 2' />

<input type='text' name='array[]' value='value 3' />

 

On submission:    

<? php foreach($_POST['array'] as $value)  echo $value.'<br />';  ?>

value 1

value 2

value 3

 

On submission:    

<? php foreach($_POST as $var => $value)  $$var = $value;     if(isset($array)) foreach($array => $value)  echo $value.'<br />'; ?>

value 1

value 2

value 3

[requinix]

Eh, I tricked myself into thinking too literally. I was actually talking about

$var = "array[]";
$before = get_defined_vars();

$$var = 123;

$after = get_defined_vars();
print_r(array_diff($after, $before));

Array
(
    [array[]] => 123
)

Edited January 9, 2014 by requinix