$POST
$_POST是我们最常用的获取POST数据的方式，它是以关联数组方式组织提交的数据，并对此进行编码处理，如urldecode，甚至编码转换，识别的数据类型是PHP默认识别的数据类型 application/x-www.form-urlencoded
无法解析如text/xml，application/json等非 application/x-www.form-urlencoded 数据类型的内容
HTTP_RAW_POST_DATA
前面说过PHP默认识别的数据类型是application/x-www.form-urlencoded,用Content-Type=application/json 类型，提交的POST数据这时候 $_POST 就无法获取到了，但是使用 $GLOBALS['HTTP_RAW_POST_DATA'] 可以获取到。因为在PHP无法识别Content-Type的时候，就会把 POST 数据填入到 $HTTP_RAW_POST_DATA 中。
需要设置 php.ini 中的 always_populate_raw_post_data 值为 On 才会生效
当$_POST 与 php://input可以取到值时 $HTTP_RAW_POST_DATA 为空
不能用于 enctype="multipart/form-data"
PHP7中已经移除了这个全局变量，用 php://input 替代
php://input
php://input 可通过输入流以文件读取方式取得未经处理的POST原始数据，允许读取 POST 的原始数据。和 $HTTP_RAW_POST_DATA 比起来，它给内存带来的压力较小。
不需要任何特殊的 php.ini 设置
不能用于 enctype="multipart/form-data"
小结
上面了介绍了一下我们目前使用PHP获取POST数据的三种方式，当我们以后使用PHP来获取POST数据的时候用$_POST或者php://input就好了。虽然HTTP_RAW_POST_DATA可以达到和php://input一样的目的，但是会给内存带来较大的压力，官方也注意到了这个问题，所以在PHP7就果断移除了这个不好用的东东。。。
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