3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [1,2,3,4]; $v = end(array_keys($a)); var_dump($v);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Notice: Only variables should be passed by reference in /in/Drg0V on line 5 int(3)
Output for 7.3.32 - 7.3.33
int(3)
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Strict Standards: Only variables should be passed by reference in /in/Drg0V on line 5 int(3)

preferences:
249.6 ms | 401 KiB | 323 Q