3v4l.org

run code in 300+ PHP versions simultaneously
<?php function a() { echo 'a'; } function b() { echo 'b'; } $condition = false; $f = ['a', 'b']; $f[$condition](); $f[!$condition](); $condition = true; $f = ['a', 'b']; $f[$condition](); $f[!$condition]();
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
abba
preferences:
76.65 ms | 408 KiB | 5 Q