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run code in 150+ php & hhvm versions
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<?php $flag = '0'; var_dump($flag === 0); var_dump($flag == 0); var_dump(0 === $flag); var_dump(0 == $flag);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true) bool(false) bool(true)
Output for hhvm-3.10.0

Process exited with code 153.