外部 URL 的 PHP readfile()

Question

我可以在 readfile() 中使用外部 URL 吗？

    header('Content-type: application/pdf');
    header('Content-Transfer-Encoding: binary');
    header('Content-Disposition: inline; filename="'.$file.'" ');
    //header('Content-Length: ' . filesize("http:...z/pub/".$file.'.pdf'));
    @readfile("http://...z/pub/".$file.'.pdf');

Answer 1

readfile 上的 PHP 手册状态:

A URL can be used as a filename with this function if the fopen wrappers have been enabled. See fopen() for more details on how to specify the filename. See the Supported Protocols and Wrappers for links to information about what abilities the various wrappers have, notes on their usage, and information on any predefined variables they may provide.

作为替代方案，您还可以使用 file_get_contents:

echo file_get_contents("http://...z/pub/".$file.'.pdf');