How to extract $_GET / $_POST parameters in PHP

How the contents from the superglobal arrays $_GET and $_POST can be transferred into normal variables?

If the register_globals setting has been deactivated (which should be the case), the GET and POST parameters can only be accessed via the superglobals of the same name ($_GET, $_POST). As soon as register_globals is switched on, however, a variable with the same name is created for each parameter. When calling up http://www.example.com/index.php?name=Alex&age=25, for example, the variables “name” (with value “Alex”) and “age” (with value “25”) would be generated fully automatically. To simulate this behavior, the function extract() can be used on $_GET and / or $_POST. The function reads all key-value pairs and creates variables with the key as name and the value as variable content.
 

 

Example : extract()

The following example applies extract() to some sample GET data.

<?php
    // Fill $_GET with sample data
    $_GET = array('name' => 'Alex', 'age' => '25');
 
    // $name doesn't exist yet, so that should produce an error
    var_dump($name);
 
    // Extract parameters from $_GET
    extract($_GET);
 
    // Output extracted parameters
    // this time the output of $name should not produce an error
    var_dump($name);
    var_dump($age);
?>

Output:

Notice:  Undefined variable: name in [...][...] on line 6
NULL
string(4) "Alex"
string(2) "25"

We can do the same thing to extract data from $_POST array.
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