php-这段PHP代码是什么意思呀?
php$globals = array($_REQUEST, $_SESSION, $_SERVER, $_FILES);
foreach($globals as $global){ foreach(array_keys($global) as $key){ unset(${$key}); }}
$globals = array($_REQUEST, $_SESSION, $_SERVER, $_FILES);
foreach($globals as $global){ foreach(array_keys($global) as $key){ unset(${$key}); }}
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