PHP store function in array - php

Question

i want to store function in array
send the array to another page
then execute it
i already read Can you store a function in a PHP array but still don't know what to do
here's what i try
control.php (it start here)
<?php
function getFirstFunction(){ echo "first function executed"; }
$data = array();
$data[0] = getFirstFunction();
$data[1] = function(){ echo "second function executed"; };
$data[2] = function(){ require_once "additional.php"; };
$data[3] = "my string";
header('Location: view.php?data='.$data);
?>
additional.php
<?php echo "additional included" ?>
view.php
<?php
if( isset($_GET['data']) ){
foreach( $_GET['data'] as $temp ){
if( is_callable($temp) ){
$temp;
}else{
"its not a function";
}
}
}
?>
my error =
Warning: Invalid argument supplied for foreach() in D:\Workspace\Web\latihanns\php\get\view.php on line 4
EDIT
thanks for notify that this code its dangerous.i'm not use this code in real live. i just try to learn store function in array then call it. then i just curious how if i call it on another page. i just simply curious... i make my code look clear and simple here because i afraid if i wrote complicated code, no one will be here or my post will closed as too localized...

Answer 1

If you want to pass anything than string into URL, only option is convert it to string form which is reversible to original types. PHP offers function called serialize() which converts anything to string. After that, you can call unserialize() to convert string back to original data. So you have to change one line in control.php to this:
header('Location: view.php?data='.serialize($data));
In file view.php you have to change one line to this:
foreach( unserialize($_GET['data']) as $temp ){
But you have to fix more things than this. If you have callable variable, you can't invoke function with $variable, but with $variable(). It is good to mention, that in PHP does not matter if you have real function (anonymous function, Closure etc.) in variable, or if variable is simple string with name of exists function.
However you have even another bug in control.php. Code $data[0] = getFirstFunction(); will not pass function getFirstFunction an make it callable, it just calls the function and put its return value to variable. You can define getFirstFunction as anonymouse function like function in $data[1] or just pass it as string like $data[0] = 'getFirstFunction' which will work.
At the end - as anyone mentioned here - IT IS VERY DANGEROUS ans you shouldn't use this on public server.