Test to create var in global scope from class method

add var on global scope.php

<?php

/**
 * Test with https://3v4l.org/ZWMBt#v500
 * 
 * $test3 is created for 5.0.0 - 5.6.21, hhvm-3.9.1 - 3.12.0, 7.0.0 - 7.0.6
 */

$test1 = 'test1';

var_dump($GLOBALS);
/**
  array (size=9)
    '_GET' => array (size=0) empty
    '_POST' => array (size=0) empty
    '_COOKIE' => array (size=0) empty
    '_FILES' => array (size=0) empty
    '_ENV' => array (size=0) empty
    '_REQUEST' => array (size=0) empty
    '_SERVER' => array (size=32) [...]
    'GLOBALS' => &array
    'test1' => string 'test1' (length=5)
 */

class Foo
{
    public static function bar()
    {
        //$test3 = 'test3';
        $GLOBALS['test3'] = 'test3';
        var_dump($GLOBALS);
    }
}

$test2 = 'test2';
Foo::bar();

/**
  array (size=9)
    '_GET' => array (size=0) empty
    '_POST' => array (size=0) empty
    '_COOKIE' => array (size=0) empty
    '_FILES' => array (size=0) empty
    '_ENV' => array (size=0) empty
    '_REQUEST' => array (size=0) empty
    '_SERVER' => array (size=32) [...]
    'GLOBALS' => &array
    'test1' => string 'test1' (length=5)
    'test2' => string 'test2' (length=5)
    'test3' => string 'test3' (length=5)
 */

var_dump(isset($test3)); //boolean true
var_dump($test3); //string 'test3' (length=5)