CODEWITHSUNDEEP
phprequest
user1771176
user1771176

Reputation: 19

How to write ${$var} with $_REQUEST[]

The following example works fine:

$name = 'MrSmith';
$var  = 'name';
echo ${$var};

But when submitted I need to use $_REQUEST and I can not figure out how to write it. This did not work:

$_REQUEST[${$var}]

What is the correct syntax for this?

Upvotes: 0

Views: 254

Answers (2)

None
None

Reputation: 5649

$$var is a variable variable. If $var is equal to 'name' as described in your question it will look for the variable $name. $name is undefined. Consider the following:

$var = 'name';
$_REQUEST['name'] = 'test';

$_REQUEST[$$var]; // is the same as...
$_REQUEST[$name]; // which is the same as...
$_REQUEST[NULL]; // since $name is not set.

echo $_REQUEST[$var]; // prints 'test' because $var evaluates to 'name'.

Upvotes: 0

Brandon - Free Palestine
Brandon - Free Palestine

Reputation: 16666

I think you just want:

$_REQUEST[$var];

This will give you the value of $_REQUEST['name'] if $var = 'name'

Also for your original example, this also works:

echo $$var;

I suggest reading the section on variable variables.

Upvotes: 4

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