PHP的file_exists()对我不起作用? [英] PHP's file_exists() will not work for me?

问题描述

出于某种原因，下面的这个PHP代码无法正常工作，我无法弄清楚.

For some reason this PHP code below will not work, I can not figure it out.

这很奇怪， file_exists似乎看不到该图像确实存在，我已经检查以确保将正确的文件路径插入到file_exists函数中，并且它仍在起作用

It is very strange, file_exists does not seem to see that the image does exist, I have checked to make sure a good file path is being inserted into the file_exists function and it is still acting up

如果我将file_exists更改为！file_exists，它将返回存在的图像和不存在的图像

If I change file_exists to !file_exists it will return an images that exist and ones that do not exist

define('SITE_PATH2', 'http://localhost/');

$noimg = SITE_PATH2. 'images/userphoto/noimagesmall.jpg';
$thumb_name = 'http://localhost/images/userphoto/1/2/2/59874a886a0356abc1_thumb9.jpg';
if (file_exists($thumb_name)) {
    $img_name = $thumb_name;
}else{
    $img_name = $noimg;
}
echo $img_name;

推荐答案

file_exists()需要使用硬盘驱动器上的文件路径，而不是URL.所以你应该有更多类似的东西:

file_exists() needs to use a file path on the hard drive, not a URL. So you should have something more like:

$thumb_name = $_SERVER['DOCUMENT_ROOT'] . 'images/userphoto/1/2/2/59874a886a0356abc1_thumb9.jpg';
if(file_exists($thumb_name)) {
    some_code
}

http://us2.php.net/file_exists

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