3v4l.org

run code in 200+ php & hhvm versions
<?php $x = [0, 1]; unset($x[1]); $y = $x; $x[] = 'new'; $y[] = 'new'; last($x); last($y); var_dump(key($x)); var_dump(key($y));
based on Dv6ct
Output for 7.0.0 - 7.2.6
Fatal error: Uncaught Error: Call to undefined function last() in /in/8PLRc:9 Stack trace: #0 {main} thrown in /in/8PLRc on line 9
Process exited with code 255.
Output for 5.4.9 - 5.6.28
Fatal error: Call to undefined function last() in /in/8PLRc on line 9
Process exited with code 255.
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/8PLRc on line 3
Process exited with code 255.