3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(string $bar = null) { } foo(''); foo(null);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 - 8.3.14
Output for 5.6.0 - 5.6.40
Catchable fatal error: Argument 1 passed to foo() must be an instance of string, string given, called in /in/iPFDp on line 7 and defined in /in/iPFDp on line 3
Process exited with code 255.
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61.5 ms | 407 KiB | 5 Q