Description:
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NAN Comparison is giving unexpected results since PHP version 5.4.0 up till the latest 7.2.0beta1. I know NAN comparison should be avoided. It's just a bug report.

Test script:
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$nan = NAN;

if(0 < NAN){ echo 'TRUE'; } else { echo 'FALSE'; }
echo "\n";
if(0 < $nan){ echo 'TRUE'; } else { echo 'FALSE'; }

Expected result:
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Expected output in example script:
TRUE
TRUE

Actual result:
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Output versions 7.0.0 - 7.2.0beta1:
TRUE
FALSE

Output versions 5.4.0 - 5.6.30, hhvm-3.10.1 - 3.19.0:
FALSE
FALSE

Output versions 4.3.6 - 5.3.29:
TRUE
TRUE