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run code in 200+ php & hhvm versions
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<?php $url = ''; $result = strtolower(substr($url, -4)) === '.gif'; var_dump($result);
based on pWtoi
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
bool(false)