一直抛出'invalid file'异常，问题出在哪里？

Question

我在尝试验证要上传的文件时遇到此代码段的问题。代码来自 this page，但是当我检查 mime 类型时它一直抛出 Invalid file format. 异常。我只需要上传 PDF 文件。我尝试过的每个 PDF 文件都失败了。

这可能是什么问题？

    private function File($f) { // example from http://php.net/manual/en/features.file-upload.php
        try {
            if(!isset($f['file']['error']) || is_array($f['file']['error'])) {
                throw new RuntimeException('Invalid parameters.');
            }

            switch ($f['file']['error']) {
                case UPLOAD_ERR_OK:
                    break;
                case UPLOAD_ERR_NO_FILE:
                    throw new RuntimeException('No file sent.');
                case UPLOAD_ERR_INI_SIZE:
                case UPLOAD_ERR_FORM_SIZE:
                    throw new RuntimeException('Exceeded filesize limit.');
                default:
                    throw new RuntimeException('Unknown errors.');
            }

            if($f['file']['size'] > 10000000) {
                throw new RuntimeException('Exceeded filesize limit.');
            }

            $finfo = new finfo(FILEINFO_MIME_TYPE);

            $extentions = array(
                'pdf' => 'application/pdf',
                'pdf' => 'x-pdf',
                'pdf' => 'application/vnd.cups-pdf',
                'pdf' => 'application/vnd.sealedmedia.softseal-pdf'
            );

            $ext = array_search($finfo->file($f['file']['tmp_name']), $extentions);

            if(false === $ext) {
                throw new RuntimeException('Invalid file format.');
            }

            if(!move_uploaded_file($f['file']['tmp_name'], sprintf('./uploads/%s.%s', sha1_file($f['file']['tmp_name']), $ext))) {
                throw new RuntimeException('Failed to move uploaded file.');
            }

            echo 'File is uploaded successfully.';
        } 
        catch (RuntimeException $e) {
            echo $e->getMessage();
        }
    }

Answer 1

一个问题是：我相信你的键和值被交换了。在下面，将有一个名为 $extensions 的数组，其中一个键 pdf 与一个值 application/vnd.sealedmedia.softseal-pdf

相关联

 $extentions = array(
    'pdf' => 'application/pdf',
    'pdf' => 'x-pdf',
    'pdf' => 'application/vnd.cups-pdf',
    'pdf' => 'application/vnd.sealedmedia.softseal-pdf'
 );

我怀疑您实际上是在尝试这样做：

$extentions = array(
    'application/pdf' => 'pdf',
    'x-pdf' => 'pdf',
    'application/vnd.cups-pdf' => 'pdf',
    'application/vnd.sealedmedia.softseal-pdf' => 'pdf'
 );

$ext = @$extensions[$finfo->file($f['file']['tmp_name'])];

Answer 2

您正在用新值覆盖 $extentions 中的数组键，而不是添加新的 key/value 对。

以下代码与您的想法不符：

$extentions = array(
    'pdf' => 'application/pdf',
    'pdf' => 'x-pdf',
    'pdf' => 'application/vnd.cups-pdf',
    'pdf' => 'application/vnd.sealedmedia.softseal-pdf'
);

A var_dump($extentions); 将产生：

array(1) {
  ["pdf"]=>
  string(40) "application/vnd.sealedmedia.softseal-pdf"
}

您需要添加其他 MIME 类型，而不是覆盖它们。

一直抛出'invalid file'异常，问题出在哪里？

Keeps throwing 'invalid file' exception, where lays the issue?

php

mime-types