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run code in 150+ php & hhvm versions
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<?php $n = null; if( $n <= -1 && $n == 0) { echo is_null($n); } $n = false; var_dump( $n <= -1 && $n == 0);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1bool(true)