3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr['M3'] ='M3'; echo $arr + array("J4"=>"J4");
Output for 5.4.0 - 7.2.6
Notice: Array to string conversion in /in/ZojS6 on line 5 Array
Output for 4.3.0 - 5.3.29
Array