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run code in 200+ php & hhvm versions
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<?php $a = "3"; $hasPrefix = substr($a, 0, 1) == '_'; var_dump($hasPrefix); var_dump(intval($a));
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.1
bool(false) int(3)