3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php array_flip( array( 0=> NULL ) );
Output for 4.3.2 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_flip(): Can only flip STRING and INTEGER values! in /in/34rai on line 2
Output for hhvm-3.12.0
Warning: Can only flip STRING and INTEGER values! in /in/34rai on line 2
Output for hhvm-3.10.0
Warning: Can only flip STRING and INTEGER values! in /in/34rai on line 3
Output for 4.3.0 - 4.3.1
Warning: array_flip() [http://www.php.net/function.array-flip]: Can only flip STRING and INTEGER values! in /in/34rai on line 2