3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { function x() { return $this::class; } } class B extends A {} $x = new B; echo $x->x();
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.19, 8.3.0 - 8.3.7
B
Output for 7.0.0 - 7.0.2
Fatal error: Dynamic class names are not allowed in compile-time ::class fetch in /in/P7YN9 on line 5
Process exited with code 255.
Output for 5.5.24 - 5.5.31, 5.6.8 - 5.6.17
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/P7YN9 on line 5
Process exited with code 255.
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