致命错误：在获取mime类型时使用$ this

Question

我收到这样的错误

  

致命错误：在不在对象上下文中时使用$ this   第243行的C：\ xampp \ htdocs \ public_html \ cjls \ check.php

母鸡我试图获取mime类型的文件，如果有任何想法我怎么能解决这个问题

<?php
    $folderinfo = "filepath/filename.php";
    $folderinfo     = pathinfo($folderinfo);
    $basename = $folderinfo['basename'];
    $ext      = $folderinfo['extension'];
    $mimeTypes = array(
            "323"       => "text/h323",
            "zip"       => "application/zip"
    );

    $mime = isset($this->mime_types[$ext]) ? $this->mime_types[$ext] : "application/octet-stream";

    echo $mime;
    ?>