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run code in 300+ PHP versions simultaneously
<?php namespace One { class Request { public function getResponse() { return new Response(); } } class Response { public function __construct() { $debug = debug_backtrace(); if (count($debug) < 2 || !isset($debug[1]['class']) || strpos($debug[1]['class'], __NAMESPACE__ . '\\') !== 0) { die('Invalid context'); } echo 'Created' . PHP_EOL; } } } namespace Two { $request = new \One\Request(); $response = $request->getResponse(); // Should work $wrongResponse = new \One\Response(); // Should NOT work }

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36.41 ms | 402 KiB | 5 Q