3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a1 = array(0=>"fqcn",); $a2 = array(0=>new stdClass(),1=>"a",2=>"b"); print_r(array_merge($a1,$a2)); print_r($a1+$a2); print_r($a2+$a1);

preferences:
55.88 ms | 402 KiB | 5 Q