How to fix Error log, always_populate_raw_post_data

Inside the folder “public.html / xibo /” there is an “error_log” file with several messages with this error:

PHP Deprecated: Automatically populating $ HTTP_RAW_POST_DATA is deprecated and will be removed in a future version.
To avoid this warning set ‘always_populate_raw_post_data’ to ‘-1’ in php.ini and use the php: // input stream instead.
in Unknown on line 0

My hosting is shared, and I could not locate the option:
‘always_populate_raw_post_data’
to set to “-1”

My php is in version 5.6.
Xibo 1.8.9.

Xibo isn’t suitable for shared hosting.

You need to have proper control over the server and environment!