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run code in 300+ PHP versions simultaneously
<?php interface ServerRequestInterface {} interface ResponseInterface {} interface MiddlewareInterface { public function __invoke(ServerRequestInterface $request, ResponseInterface $response, MiddlewareInterface $next = null): ResponseInterface; } $app = new class { public function pipe() {} }; $app->pipe(new class implements MiddlewareInterface { public function __invoke(ServerRequestInterface $request, ResponseInterface $response, MiddlewareInterface $next = null): ResponseInterface { return $response; } }); Fatal error: Declaration of ::__invoke(ServerRequestInterface $request, ResponseInterface $response, MiddlewareInterface $next = NULL) ::__invoke(ServerRequestInterface $request, ResponseInterface $response, MiddlewareInterface $next = NULL): ResponseInterface in /in/ivjtg on line 15 Process exited with code 255.
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.15
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/76R8p on line 8
Process exited with code 255.

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