Get all variables from a PHP script

get_script_vars.php

<?php

//
//  Get all variables from a PHP script.
//
//  Warning: This is probably not a good idea security-wise.
//
//  Usage:
//
//    Let's say you have a script called 'test.php', which contains the following:
//
//        <?php
//        $my_var = "Hello, my variable!";
//        define('MY_CONST', 'Hello, my constant!');
//        echo 'Can you see me?';
//
//    Then you can call this function from another script, like this:
//
//        $vars = get_script_vars("test.php");
//        var_dump($vars);
//
//    You'll get this as output:
//
//        array(2) {
//          ["my_var"]=>
//          string(19) "Hello, my variable!"
//          ["MY_CONST"]=>
//          string(19) "Hello, my constant!"
//        }
//

if (isset($argv[1]) && $argv[1] == '__get_script_vars_inner__') {
  ob_start();         // Let's send the output to...
  include $argv[2];
  ob_end_clean();     // ... /dev/null

  $vars = get_defined_vars();
  $consts = get_defined_constants(true);
  $vars = array_merge($vars, $consts['user']);

  $verboten = ['argv', 'argc', '_SERVER', '_GET', '_POST', '_FILES', '_COOKIE', '_SESSION', '_REQUEST', '_ENV'];
  foreach ($verboten as $var) {
    unset($vars[$var]);
  }

  echo json_encode($vars);
} else {
  function get_script_vars($file) {
    $oldlocale = setlocale(LC_CTYPE, 0);
    setlocale(LC_CTYPE, "en_US.UTF-8");
    $my_path = escapeshellarg(__FILE__);
    $script_path = escapeshellarg($file);
    setlocale(LC_CTYPE, $oldlocale);
    $pid = posix_getpid();
    $php = escapeshellarg(exec("/bin/readlink -f /proc/$pid/exe"));
    $output = shell_exec("$php $my_path __get_script_vars_inner__ $script_path");
    return json_decode($output, true);
  }
}