getimagesize里参数路径的问题
我上传图片后，新的文件名是images/xxx.jpg，但我为了前后台都使用这个文件，我就把它转换位根路径
/guest/images/xxx.jpg,这样我在任何地方都可以调用这个图片了。但是我缩放时，用到getimagesize获取图片信息时，用images/xxx.jpg就可以，但用/guest/images/xxx.jpg就报错
Warning: getimagesize(/guest/images/xxx.jpg) [function.getimagesize]: failed to open stream: No such file or directory in
这是为什么了？我又不想换路径。
回复讨论(解决方案)
路径错误，后面的in...为什么不贴全呢
路径错误，后面的in...为什么不贴全呢
in后面指的是getimagesize;这个函数使用时的行数出错了，
但是我用
又是对的，就是getimagesize使用时出错
images/xxx.jpg 物理（文件系统）路径，以当前目录为基准
/guest/images/xxx.jpg 是统一资源定位（url）中的路径，以网站的根为基准
getimagesize 要求传入的是物理路径
images/xxx.jpg 物理（文件系统）路径，以当前目录为基准
/guest/images/xxx.jpg 是统一资源定位（url）中的路径，以网站的根为基准
getimagesize 要求传入的是物理路径
那就麻烦了，有没有什么函数把统一路径转换为物理路径了？
$_SERVER['DOCUMENT_ROOT'] . '/guest/images/xxx.jpg'
$_SERVER['DOCUMENT_ROOT'] . '/guest/images/xxx.jpg'
又学到一招，谢谢啊。
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