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run code in 150+ php & hhvm versions
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<?php $id = 1; $_GET["id"] = -1; if (isset($_GET["id"])) $id = (int) $_GET["id"]; var_dump($id);
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
int(-1)