Online PHP editor | output for VpWO9

@ 2018-01-14T13:16:09Z

<?php
spl_autoload_register(function($cname){
    if ($cname == 'IMyInterface') {
        interface IMyInterface {
            // Use any class or interface constant as value of FOO.
            // I'll just use some constant available out of the box, to keep it simple:
            const FOO = FilesystemIterator::CURRENT_AS_PATHNAME;
        }
    } elseif ($cname == 'Foo') {
        class Foo implements IMyInterface {}
    } elseif ($cname == 'Bar') {
        class Bar extends Foo implements IMyInterface {}
    }
});

// Foo is super-class for Bar.
// uncomment below line to trigger the error:
$F = new Foo();

// this should run without errors at any time, but if Foo is instantiated
// prior to this line, then the error is triggered:
$B = new Bar();

Output for 5.3.0 - 5.3.1, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Output for 5.3.2 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40: Fatal error: Cannot inherit previously-inherited or override constant FOO from interface IMyInterface in /in/VpWO9 on line 12
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/VpWO9 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/VpWO9 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/VpWO9 on line 2
Process exited with code 255.

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