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run code in 300+ PHP versions simultaneously
<?php class X { protected $name = 'I am X.'; public function __toString() { return $this->name; } } class Y { public function write(string $classy) { return $classy; } } $x = new X(); $y = new Y(); var_export($y->write($x));

preferences:
24.48 ms | 404 KiB | 5 Q