Description:
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Comparison of the float NAN value to any other value is supposed to return false - as the docs of the float type says.

In PHP 5.4 to 5.6 the result is false, as expected.

In PHP 7.0, the comparison returns true.

Reproduced on Windows 7 (64bit) as well as at https://3v4l.org/GkqZZ

Test script:
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<?php
var_dump(NAN < 1.0);

Expected result:
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bool(false)

Actual result:
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bool(true)