3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr1 = array('req'=>false, 'lessthan'=>10); $arr2 = array('parent'=> array('parent_name'=>array('val1'), 'rules'=>array('req'=>false))); $arr3 = array('a', 'b', 'c'); $arrE = array(); var_dump(implode(',', $arrE));
Output for 7.1.25 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(0) ""

preferences:
188.82 ms | 403 KiB | 182 Q