3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(&$var) { // echo $GLOBALS["baz"]; $x = 1; $var = $x; } $bar = 'bar'; foo($bar = 3); var_dump($bar);
Output for 8.3.0 - 8.3.4
Fatal error: Uncaught Error: foo(): Argument #1 ($var) could not be passed by reference in /in/kpoe5:9 Stack trace: #0 {main} thrown in /in/kpoe5 on line 9
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17
Fatal error: Uncaught Error: foo(): Argument #1 ($var) cannot be passed by reference in /in/kpoe5:9 Stack trace: #0 {main} thrown in /in/kpoe5 on line 9
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Only variables should be passed by reference in /in/kpoe5 on line 9 int(3)
Output for 7.3.32 - 7.3.33, 7.4.26
int(3)

preferences:
149.93 ms | 401 KiB | 184 Q