notice:undefined Index:http_raw_post_data in D:program files solution in PHP

notice:undefined index:http_raw_post_data in D:\Program Files appears in PHP
I wrote it in PHP:

$POSTSTR = $GLOBALS ["Http_raw_post_data"];
After running
notice:undefined Index:http_raw_post_data in D:\Program files\phpenv\phpdemo\shm_php01\shm01.php on line 47 appears in PHP

Then I removed the Always_populate_raw_post_data = on comment from the php.ini file.

; Always populate the $HTTP _raw_post_data variable. PHP ' s default behavior is
; To disable this feature. If post reading is disabled through
; Enable_post_data_reading, $HTTP _raw_post_data is *not* populated.
; Http://php.net/always-populate-raw-post-data
Always_populate_raw_post_data = On

Restart is still not used, ask the man to guide the maze
------to solve the idea----------------------
Always_populate_raw_post_data = On

When submitted as post, available
echo $HTTP _raw_post_data;
Print out the submitted unformatted string.

Of course not when the post is submitted, it is undefined
------to solve the idea----------------------
Actually, this could have been replaced with file_get_contents (' Php://input ').
------to solve the idea----------------------
Direct run, of course, is to return directly
If post is submitted, it will be.
------to solve the idea----------------------
You have to write a form when you test.

