php图片上传器

Question

我有一个非常简单的照片上传器，需要一些提速。

首先，当页面加载时会出现回声，甚至在框中什么都没有？

if($_POST['upload']) {
     if($_FILES['image']['name'] == "")
     {
         #there's no file name return an error
         echo "\n<b>Please select a file to upload!\n</b>";
         exit;
     }
     #we have a filename, continue
}

#directory to upload to
$uploads = '/home/habbonow/public_html/other/quacked/photos';
$usruploads = 'photos';

#allowed file types
$type_array = array('image/gif','image/pjpeg','image/x-png');

if(!in_array($_FILES['image']['type'], $type_array))
{
    #the type of the file is not in the list we want to allow
    echo "\n<b>That file type is not allowed!\n</b>";
    exit;
}

页面输出显示上传框，但也回覆“不允许文件类型！”即使我还没按下按钮。

第二，jpg的mime类型是什么，因为我有jpeg和pjpeg。

谢谢，任何帮助都感谢。

Answer 1

我还建议将所有内容都放在POST块中，否则不管加载什么内容，都会在加载页面时对其进行评估。

对于mimetype，有一个方法类型，它允许您传入一个表示给定文件类型的常量，并返回适当的mimetype，例如：

$type_array = array(image_type_to_mime_type(), image_type_to_mime_type(IMAGETYPE_GIF), image_type_to_mime_type(IMAGETYPE_PNG), 'image/pjpeg');

(因为pjpeg没有它自己的常量，所以我们可以手动添加它)

Answer 2

如果您还没有提交表单，我认为，因为$_FILES‘映像’将不存在，所以！内联调用很可能返回false。

为此，我很想把整件事放在第一个if声明中：

if($_POST['upload']) {
     if($_FILES['image']['name'] == "")
     {
         #there's no file name return an error
         echo "\n<b>Please select a file to upload!\n</b>";
         exit;
     }
     #we have a filename, continue


     #directory to upload to
     $uploads = '/home/habbonow/public_html/other/quacked/photos';
     $usruploads = 'photos';

     #allowed file types
     $type_array = array('image/gif','image/pjpeg','image/x-png');

     if(!in_array($_FILES['image']['type'], $type_array))
     {
         #the type of the file is not in the list we want to allow
         echo "\n<b>That file type is not allowed!\n</b>";
         exit;
     }
}