php change post data to variable

Question

I'm trying to change given $_POST data to variable format, here is my code:

<?php
$_POST["abc"]=2;
$post = array("abc");

foreach($post as $field) {
    global $field;
    $field = $_POST[$field];
}

echo $abc;
?>

but when I'm trying to run this code, I only get:

PHP Notice: Undefined variable: abc in /var/www/ on line 8

How can I change chosen POST variables in loop to normal variables? (eg. $_POST["abc"] to $abc)

Answer 1

Use the extract function

extract($_POST)

Answer 2

You can tried with PHP variable variable.

<?php
$_POST["abc"]=2;
$post = array("abc");

foreach($post as $field) {
     global $$field;
     $$field = $_POST[$field];
}

echo $abc;

?>