3v4l.org

run code in 300+ PHP versions simultaneously
<?php if (defined('HHVM_VERSION')) { exit('*HHVM skipped*'); } // The following line will emit some error if current()'s argument cannot be passed by value var_dump(current(array_flip(array('foo' => 'bar'))));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.4, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
string(3) "foo"
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/COcBl on line 8
Process exited with code 255.
preferences:
93.94 ms | 406 KiB | 5 Q