PHP:exif_imagetype()无法正常工作? [英] PHP: exif_imagetype() not working?

问题描述

我有这个扩展程序检查器:

I have this extension checker:

$upload_name = "file";
$max_file_size_in_bytes = 8388608;
$extension_whitelist = array("jpg", "gif", "png", "jpeg");

/* checking extensions */
$path_info = pathinfo($_FILES[$upload_name]['name']);
$file_extension = $path_info["extension"];
$is_valid_extension = false;
foreach ($extension_whitelist as $extension) {
    if (strcasecmp($file_extension, $extension) == 0) {
        $is_valid_extension = true;
        break;
    }
}
if (!$is_valid_extension) {
    echo "{";
    echo        "error: 'ext not allowed!'\n";
    echo "}";
    exit(0);
}

然后我添加了这个:

if (exif_imagetype($_FILES[$upload_name]['name']) != IMAGETYPE_GIF 
        OR exif_imagetype($_FILES[$upload_name]['name']) != IMAGETYPE_JPEG 
        OR exif_imagetype($_FILES[$upload_name]['name']) != IMAGETYPE_PNG) {
    echo "{";
    echo        "error: 'This is no photo..'\n";
    echo "}";
    exit(0);
}

将其添加到imageupload函数后，该函数将立即停止工作.我没有任何错误，甚至没有我自己给自己这不是照片"的错误，这可能是什么问题?

As soon when I added this to my imageupload function, the function stops working. I dont get any errors, not even the one i made myself "this is no photo", what could be wrong?

只需与我的房东确认.它们支持功能exif_imagetype()

Just checked with my host. They support the function exif_imagetype()

推荐答案

以下是开关用法的示例:

Here is the example with the switch usage:

switch(exif_imagetype($_FILES[$upload_name]['name'])) {
    case IMAGETYPE_GIF:
    case IMAGETYPE_JPEG:
    case IMAGETYPE_PNG:
        break;
    default:
        echo "{";
        echo        "error: 'This is no photo..'\n";
        echo "}";
        exit(0);
}

您的脚本也可以使用，但是您必须在条件之间加上AND:

Your script can be used too, but you have to put AND between conditions:

if (exif_imagetype($_FILES[$upload_name]['name']) != IMAGETYPE_GIF 
        AND exif_imagetype($_FILES[$upload_name]['name']) != IMAGETYPE_JPEG 
        AND exif_imagetype($_FILES[$upload_name]['name']) != IMAGETYPE_PNG) {
    echo "{";
    echo        "error: 'This is no photo..'\n";
    echo "}";
    exit(0);
}

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