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run code in 300+ PHP versions simultaneously
<?php class X { } class Y extends X { } class Blah { public function blah(X $x) { $this->bleh($x); } public function bleh(Y $x) { echo "Hello\n"; } } $x = new Y; $b = new Blah; $b->blah($x);
Output for git.master, git.master_jit, rfc.property-hooks
Hello

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