3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var1 = "1"; $var2 = "2"; $temp1 = "var" . "5"; $temp2 = "var" . "2"; var_dump(${$temp5} ?? ${$temp2});
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined variable $temp5 in /in/lBYGr on line 7 string(1) "2"
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
Notice: Undefined variable: temp5 in /in/lBYGr on line 7 string(1) "2"
Output for 7.3.32 - 7.3.33
string(1) "2"
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '?' in /in/lBYGr on line 7
Process exited with code 255.
preferences:
245.7 ms | 402 KiB | 376 Q