3v4l.org

run code in 500+ PHP versions simultaneously
<?php enum qux { const foo_alias = self::foo; case foo; } var_dump(qux::foo_alias); // enum(qux::foo)
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.5 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
enum(qux::foo)
Output for 8.0.1 - 8.0.27
Parse error: syntax error, unexpected identifier "qux" in /in/84W92 on line 3
Process exited with code 255.
Output for 4.3.0
Parse error: parse error, unexpected T_STRING in /in/84W92 on line 3
Process exited with code 255.
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