PHP函数pt_register

Question

我是PHP的初学者,我接触过处理过的HTML表单,我正在学习如何使用它来做更多...

我正在使用这个功能(并且基于Google,因此有很多人)但我真的想了解它在做什么......

function pt_register()
{
  $num_args = func_num_args();
   $vars = array();

   if ($num_args >= 2) {
       $method = strtoupper(func_get_arg(0));

       if (($method != 'SESSION') && ($method != 'GET') && ($method != 'POST') && ($method != 'SERVER') && ($method != 'COOKIE') && ($method != 'ENV')) {
           die('The first argument of pt_register must be one of the following: GET, POST, SESSION, SERVER, COOKIE, or ENV');
     }

       $varname = "HTTP_{$method}_VARS";
      global ${$varname};

       for ($i = 1; $i < $num_args; $i++) {
           $parameter = func_get_arg($i);

           if (isset(${$varname}[$parameter])) {
               global $$parameter;
               $$parameter = ${$varname}[$parameter];
          }

       }

   } else {
       die('You must specify at least two arguments');
   }

}

任何人都可以用英语为我解决这个问题吗？

Answer 1

看起来它正试图成为register_globals的替代品

function pt_register()
{
  // Look at the arguments passed in...
  $num_args = func_num_args();
   $vars = array();

   // .. we need at least 2 arguments
   if ($num_args >= 2) {

        // $method is the middle part of name of one of PHPs old-style variables
       $method = strtoupper(func_get_arg(0));

       if (($method != 'SESSION') && ($method != 'GET') && ($method != 'POST') && ($method != 'SERVER') && ($method != 'COOKIE') && ($method != 'ENV')) {
           die('The first argument of pt_register must be one of the following: GET, POST, SESSION, SERVER, COOKIE, or ENV');
     }

      // $varname is the whole name of the variable
       $varname = "HTTP_{$method}_VARS";

      // Make the global variable (for example HTTP_SESSION_VARS) accessible from this function
      // ${$varname} is using a technique called "variable variables"
      // If $varname == "HTTP_SESSION_VARS" then $$varname (or ${$varname}) is the same as $HTTP_SESSION_VARS
      global ${$varname};

       // For each argument after the method
       for ($i = 1; $i < $num_args; $i++) {
           $parameter = func_get_arg($i);

           // If the parameter exists in the global variable...
           if (isset(${$varname}[$parameter])) {
               // .. make it global...
               global $$parameter;
               // ... and set its value
               $$parameter = ${$varname}[$parameter];
          }

       }

   } else {
       die('You must specify at least two arguments');
   }

}

所以,例如:pt_register('SESSION', 'foo');确实如此

function example()
{
    global $HTTP_SESSION_VARS;
    global $foo;
    $foo = $HTTP_SESSION_VARS['foo'];
}

恕我直言,这个剧本已经过时而且邪恶!superglobals $ _SESSION等意味着你不应该这样做