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<?php function foo(&$http_response_header) { file_get_contents('http://www.example.com'); } $x = null; foo($x); var_dump($x);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: file_get_contents(): php_network_getaddresses: getaddrinfo for www.example.com failed: System error in /in/k7e5N on line 4 Warning: file_get_contents(http://www.example.com): Failed to open stream: php_network_getaddresses: getaddrinfo for www.example.com failed: System error in /in/k7e5N on line 4 NULL

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