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run code in 300+ PHP versions simultaneously
<?php $a = <<<EOF <?php class a { const a = b::c; const b = b::d; } EOF; file_put_contents('/tmp/A.php', $a); $b = <<<EOF <?php class b { const c = a::b; const d = 1; } EOF; file_put_contents('/tmp/B.php', $b); spl_autoload_register(function($class) { require('/tmp/'. $class .'.php'); }); var_dump(A::a, A::b, B::c, B::d);

preferences:
39.81 ms | 402 KiB | 5 Q