Get the Mine-Type of a File

getMineType.php

<?php
/**
* get mime data of the file.
* @return {String} mime-type of the given file
* @param $filename String
*/
function get_mime($filename){
    preg_match("/\.(.*?)$/", $filename, $m);    # Get File extension for a better match
    switch(strtolower($m[1])){
        case "js": return "application/javascript";
        case "json": return "application/json";
        case "jpg": case "jpeg": case "jpe": return "image/jpg";
        case "png": case "gif": case "bmp": return "image/".strtolower($m[1]);
        case "css": return "text/css";
        case "xml": return "application/xml";
        case "html": case "htm": case "php": return "text/html";
        default:
            if(function_exists("mime_content_type")){ # if mime_content_type exists use it.
               $m = mime_content_type($filename);
            }else if(function_exists("")){    # if Pecl installed use it
               $finfo = finfo_open(FILEINFO_MIME);
               $m = finfo_file($finfo, $filename);
               finfo_close($finfo);
            }else{    # if nothing left try shell
               if(strstr($_SERVER[HTTP_USER_AGENT], "Windows")){ # Nothing to do on windows
                   return ""; # Blank mime display most files correctly especially images.
               }
               if(strstr($_SERVER[HTTP_USER_AGENT], "Macintosh")){ # Correct output on macs
                   $m = trim(exec('file -b --mime '.escapeshellarg($filename)));
               }else{    # Regular unix systems
                   $m = trim(exec('file -bi '.escapeshellarg($filename)));
               }
            }
            $m = split(";", $m);
            return trim($m[0]);
    }
}
?>