3v4l.org

run code in 300+ PHP versions simultaneously
<?php /* $x = TRUE; <- TRUE; $x = FALSE; <- FALSE; $x = TRUE; */ function x($x){ return (!$x = !$x ? TRUE : FALSE); } var_dump(TRUE); var_dump(FALSE);
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(false)
preferences:
223.57 ms | 404 KiB | 227 Q