Description:
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With PHP 7 it seems filter_input(INPUT_ENV, 'PATH') does not work anymore. It returns NULL whereas previous PHP versions returned the same as $_ENV['PATH']

It is not just the PATH variable, the whole function filter_input_array(INPUT_ENV) returns NULL, even though $_ENV is not empty.

variables_order is set to "EGPCS"

This looks similar to https://bugs.php.net/bug.php?id=52209

Test script:
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var_dump($_ENV['PATH']); // to check if it really has data
var_dump(filter_input(INPUT_ENV, 'PATH')); // this returns NULL, but should return the same as the previous command

Expected result:
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string(59) "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin"
string(59) "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin"


Actual result:
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string(59) "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin"
NULL