3v4l.org

run code in 300+ PHP versions simultaneously
<?php class base { protected $x = ['123']; } class x extends base { protected array $x = ['123']; }
Output for 8.1.0 - 8.1.22, 8.2.0 - 8.2.9
Fatal error: Type of x::$x must not be defined (as in class base) in /in/kTQ7q on line 7
Process exited with code 255.
Output for 8.0.1 - 8.0.30
Fatal error: Type of x::$x must not be defined (as in class base) in /in/kTQ7q on line 9
Process exited with code 255.
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153.96 ms | 1001 KiB | 8 Q