file_get_contents("php://input","

file_get_contents("php://input","r")实

解释不清，直接上例子
index.html
代码如下:

action.php
代码如下:
$raw_post_data = file_get_contents('php://input', 'r');
echo "-------\$_POST------------------
";
echo var_dump($_POST) . "
";
echo "-------php://input-------------
";
echo $raw_post_data . "
";
?>