3v4l.org

run code in 300+ PHP versions simultaneously
<?php $TEST = ""; if ($TEST.is_null()) echo "true"; else echo "false";
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught ArgumentCountError: is_null() expects exactly 1 argument, 0 given in /in/5Ttg9:5 Stack trace: #0 /in/5Ttg9(5): is_null() #1 {main} thrown in /in/5Ttg9 on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 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, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: is_null() expects exactly 1 parameter, 0 given in /in/5Ttg9 on line 5 false
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: is_null(): Only one argument expected in /in/5Ttg9 on line 5 false
Output for 4.3.0 - 4.3.1
Warning: is_null() [http://www.php.net/function.is-null]: Only one argument expected in /in/5Ttg9 on line 5 false

preferences:
242.08 ms | 401 KiB | 311 Q