清空全部$_POST值
if (count($_POST) > 0) {
$_POST = array();
}清空全部$_GET值
if (count($_GET) > 0) {
$_GET = array();
}
清空特定的$_POST值
if(isset($_POST['baidu'])){
unset($_POST['baidu']);
}清空特定的$_GET值
if(isset($_GET['baidu'])){
unset($_GET['baidu']);
}
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