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run code in 300+ PHP versions simultaneously
<?php $falseArr = [ '', '0', 0, false, [], null ]; $trueArr = [ ' ', 'false', '123', 'abc', 1, true, ['val'], new stdClass, function(){} ]; $print = function ($arr) { foreach ($arr as $v) { var_dump($v==false); } }; $print($falseArr); echo "\n"; $print($trueArr);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(true) bool(true) bool(true) bool(true) bool(true) bool(true) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false)

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152.73 ms | 403 KiB | 183 Q