3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = [1, 3, 3]; $arr = array(&$arr); var_dump($arr); var_dump($arr === $arr);
Output for 5.4.5 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } bool(true)
Output for 5.4.0 - 5.4.4
array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } Fatal error: Nesting level too deep - recursive dependency? in /in/RVG0o on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/RVG0o on line 2
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/RVG0o on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/RVG0o on line 2
Process exited with code 255.