如果/其他不正常 [英] If/else isn't working properly

问题描述

我在codeigniter内部使用了一个验证功能。

I have a validation function I'm using inside of codeigniter.

function valid_image() {
    if ( ($_FILES["file"]["type"] != "image/jpeg") || ($_FILES["file"]["type"] != "image/gif")  ) {
    $this->form_validation->set_message('valid_image', 'Wrong file type..');

    return false;
} else {
    return true;
}

在if语句中仅使用 image / jpeg部分就可以了。如果我尝试上传除jpg文件以外的任何内容，它将失败。如果我运行上面的代码，则它会同时显示jpg或gif文件。

With just the "image/jpeg" part in the if statement it works fine. If I try to upload anything other than a jpg file it fails. If I run the code above, it fails with both a jpg or a gif file.

在有人说为什么不使用上载类之前，我不能。我将照片直接保存到MongoDB中，因此上载类没有太大帮助。

And before someone says "why not use the upload class," I can't. I'm saving my pics directly into MongoDB, so the upload class doesn't help much.

推荐答案

回答您的问题，但是...

This doesn't really answer your question, but...

已设置 $ _ FILE [blah] [ type] 参数

您可能想使用 exif_imagetype（$ _ FILES [ file

You may want to use exif_imagetype($_FILES["file"]["tmp_name"]) instead to detect the true image type.

function valid_image() {
    $type = exif_imagetype($_FILES["file"]["tmp_name"]);
    if (($type != IMAGETYPE_GIF) && ($type != IMAGETYPE_JPEG)) {
        $this->form_validation->set_message('valid_image', 'Wrong file type..');
        return false;
    } else {
        return true;
    }
}

编辑：如果未安装exif扩展，您还可以执行以下操作：

If the exif extension isn't installed, you can also do this:

$sizes = getimagesize($_FILES["file"]["tmp_name"]);

$ sizes [2] 将包含一个与 IMAGETYPE常量之一相对应的值。

$sizes[2] will contain a value corresponding to one of the IMAGETYPE constants.

function valid_image() {
    $sizes = getimagesize($_FILES["file"]["tmp_name"]);
    if (($sizes[2] != IMAGETYPE_GIF) && ($sizes[2] != IMAGETYPE_JPEG)) {
        $this->form_validation->set_message('valid_image', 'Wrong file type..');
        return false;
    } else {
        return true;
    }
}

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