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[PHP] Error from error log on remote hosting site

I have opened and seen the following error in the error log
for my remote web hosting service site:

[08-Mar-2017 01:55:29 America/Chicago] 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

From phpinfo the version is 5.6.30.

My web site is programmed essentially to present one page with content that is determined by
get queries attached to href values in anchor tags and such. It roughly follows an MVC model.

So what does this mean for my site? 

And how would I use the php:// stream? With explode and looping through to construct
the variables and values?

Thank you for time and attention:

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