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run code in 150+ php & hhvm versions
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<?php $a = array("", 0, array(), "1", "0"); foreach ($a as $b) { $c = (bool)$b; echo var_dump($b) . " result = " . var_dump($c); }
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(0) "" bool(false) result = int(0) bool(false) result = array(0) { } bool(false) result = string(1) "1" bool(true) result = string(1) "0" bool(false) result =