为什么要UNSET?

2011-03-05 01:12:52 225 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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[code=PHP]
final class MyClass {
public $get = array();
public $post = array();
public $cookie = array();
public $files = array();
public $server = array();

public function __construct() {
$_GET = $this->clean($_GET);
$_POST = $this->clean($_POST);
$_COOKIE = $this->clean($_COOKIE);
$_FILES = $this->clean($_FILES);
$_SERVER = $this->clean($_SERVER);

$this->get = $_GET;
$this->post = $_POST;
$this->cookie = $_COOKIE;
$this->files = $_FILES;
$this->server = $_SERVER;
}

public function clean($data) {
if (is_array($data)) {
foreach ($data as $key => $value) {
unset($data[$key]);

$data[$this->clean($key)] = $this->clean($value);
}
} else {
$data = htmlspecialchars($data, ENT_COMPAT, 'UTF-8');
}

return $data;
}
}
[/Code]

用echo回显了相关变量, new 一个 MyClass 后, 又回显一次, 没什么不同啊..

就是奇怪,这些网上的代码,经常性了unset一下一些全局变量.

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