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run code in 150+ php & hhvm versions
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<?php $i=-1; for (;$i=$i+1,$i<5;) { printf("%d ", $i); } echo "\n"; var_dump($i=$i+1,$i<5);
Output for 4.3.0 - 7.1.0
0 1 2 3 4 int(6) bool(false)