At PHP 5.6+ you can suppress the Deprecated messages by setting:
always_populate_raw_post_data = -1
More information here: https://bugs.php.net/bug.php?id=66763
$HTTP_RAW_POST_DATA — 原生POST数据
This feature was DEPRECATED in PHP 5.6.0, and REMOVED as of PHP 7.0.0.
$HTTP_RAW_POST_DATA 包含 POST 提交的原始数据。参见 always_populate_raw_post_data
一般而言，使用 php://input 代替 $HTTP_RAW_POST_DATA。
At PHP 5.6+ you can suppress the Deprecated messages by setting:
always_populate_raw_post_data = -1
More information here: https://bugs.php.net/bug.php?id=66763
what is exaclty raw POST data?
Answer:
$_POST can be said as and outcome after splitting the $HTTP_RAW_POST_DATA, php splits the raw post data and formats in the way we see it in the $_POST For example:
$HTTP_RAW_POST_DATA looks something like this
key1=value1&key2=value2
then $_POST would look like this:
$_POST = array(
"key1" => "value1",
"key2" => "value2",);
To get the Raw Post Data:
<?php $postdata = file_get_contents("php://input"); ?>
Please see the notes here:
http://us.php.net/manual/en/wrappers.php.php