3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr1 = []; $arr2 = [[1, 2]]; var_dump(array_merge($arr1, $arr2));
Output for 5.4.0 - 7.3.0rc4
array(1) { [0]=> array(2) { [0]=> int(1) [1]=> int(2) } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/4KsM6 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/4KsM6 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/4KsM6 on line 3
Process exited with code 255.