Description:
------------
In some situations, if you have auto_globals_jit enables then not only are super global variables not initialized unless they are called, the underlying data storage for the original data[used by filter_input] will not be populated.

As I read filter.c, there seems to be a weird schism on how it deals with this.
https://github.com/php/php-src/blob/master/ext/filter/filter.c#L526

For INPUT_SERVER and INPUT_ENV it seems as if filter will make sure to initialize the data, example:
        if (PG(auto_globals_jit)) {
                                zend_is_auto_global("_SERVER", sizeof("_SERVER")-1 TSRMLS_CC);
                        }

For INPUT_POST, INPUT_GET, and INPUT_COOKIE however there is no safety net.

Test script:
---------------
<?php

// execute from web browser as http://domain/filename.php?test=123

$before = filter_input(INPUT_GET, 'test');  // $before = null
$var = $_GET('test');           // $var = 'test'
$after = filter_input(INPUT_GET, 'test');       // $after = 'test'

if ($before !== $after)
{
echo 'Raw input failed to load';
}