3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array( '' => 'foo', 'foo' => '', null, array(), 1, true, false, ); foreach($a as $k => $v) { echo "$k => $v\n"; var_dump(!empty($a[$k])); var_dump(isset($a[$k]) && $a[$k]); }

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