如何在PHP 5.5中获取文件的MIME类型？

Question

我mime_content_type()在PHP 5.5中使用以获取MIME类型,但它会抛出fatal: error function not found.

如何在PHP 5.5上实现这一点？

Answer 1

利用这些finfo()功能.

一个简单的例子:

<?php
$finfo = finfo_open(FILEINFO_MIME_TYPE);
echo finfo_file($finfo, "path/to/image_dir/image.gif");
finfo_close($finfo);

OUTPUT :

image/gif

^{注意:Windows用户必须php_fileinfo.dll在php.ini中包含捆绑的DLL文件才能启用此扩展.}

Answer 2

我花了太多时间试图让finfo函数正常工作.我终于最终创建了自己的函数来将文件扩展名与任何mime类型数组相匹配.它不是一种完全证明文件确实是扩展名表示的文件的完全证明方式,但是这个问题可以通过如何处理服务器上的所述文件的I/O来减轻.

function mime_type($file) {

    // there's a bug that doesn't properly detect
    // the mime type of css files
    // https://bugs.php.net/bug.php?id=53035
    // so the following is used, instead
    // src: http://www.freeformatter.com/mime-types-list.html#mime-types-list

    $mime_type = array(
        "3dml" => "text/vnd.in3d.3dml",
        "3g2" => "video/3gpp2",
        "3gp" => "video/3gpp",
        "7z" => "application/x-7z-compressed",
        "aab" => "application/x-authorware-bin",
        "aac" => "audio/x-aac",
        "aam" => "application/x-authorware-map",
        "aas" => "application/x-authorware-seg",
        "abw" => "application/x-abiword",
        "ac" => "application/pkix-attr-cert",
        "acc" => "application/vnd.americandynamics.acc",
        "ace" => "application/x-ace-compressed",
        "acu" => "application/vnd.acucobol",
        "adp" => "audio/adpcm",
        "aep" => "application/vnd.audiograph",
        "afp" => "application/vnd.ibm.modcap",
        "ahead" => "application/vnd.ahead.space",
        "ai" => "application/postscript",
        "aif" => "audio/x-aiff",
        "air" => "application/vnd.adobe.air-application-installer-package+zip",
        "ait" => "application/vnd.dvb.ait",
        "ami" => "application/vnd.amiga.ami",
        "apk" => "application/vnd.android.package-archive",
        "application" => "application/x-ms-application",
        // etc...
        // truncated due to Stack Overflow's character limit in posts
    );

    $extension = \strtolower(\pathinfo($file, \PATHINFO_EXTENSION));

    if (isset($mime_type[$extension])) {
        return $mime_type[$extension];
    } else {
        throw new \Exception("Unknown file type");
    }

}

编辑:

我想谈谈达乌兹的评论(因为它一直在起来投票),并提醒大家我在顶部放置伪免责声明,这不是"完全证明".因此,在考虑我在答案中提供的方法时,请记住这一点.

Answer 3

mime_content_type() 不被弃用,工作正常.

为什么PHP中不推荐使用mime_content_type()？

http://php.net/manual/en/function.mime-content-type.php

从PHP 5.3开始,它甚至内置.