PHP自动根据文件后缀返回mime type

这个是从一个程序里面提取出来的，包含了1012个文件后缀，应该是足够日常使用了，而且我对于没有的文件后缀自动返回了二进制流的形式。

并且我做成了接口形式：

PHP代码：

if(@$_GET['act'] == "test"){
function get_mime_type($fileext){
    $main_list = dirname(__FILE__).DIRECTORY_SEPARATOR.'mime-list.txt';
    $wpeft_list = trim(file_get_contents($main_list));
    $types_list = @unserialize($wpeft_list);
    foreach ($types_list as $type) {
      foreach ($type->extensions as $ext) {
            if($ext == $fileext){
                $mime_type = $type->mime_type;
                break 2;
            }
      }
    }
    $mime_type = $mime_type?$mime_type:"application/octet-stream";
    return $mime_type;
}
$fileext = $_GET['ext'];
echo get_mime_type($fileext);
exit;
}
if(@$_GET['act'] == "test"){
function get_mime_type($fileext){
    $main_list = dirname(__FILE__).DIRECTORY_SEPARATOR.'mime-list.txt';
    $wpeft_list = trim(file_get_contents($main_list));
    $types_list = @unserialize($wpeft_list);
    foreach ($types_list as $type) {
      foreach ($type->extensions as $ext) {
            if($ext == $fileext){
                $mime_type = $type->mime_type;
                break 2;
            }
      }
    }
    $mime_type = $mime_type?$mime_type:"application/octet-stream";
    return $mime_type;
}
$fileext = $_GET['ext'];
echo get_mime_type($fileext);
exit;
}
if(@$_GET['act'] == "test"){
function get_mime_type($fileext){
    $main_list = dirname(__FILE__).DIRECTORY_SEPARATOR.'mime-list.txt';
    $wpeft_list = trim(file_get_contents($main_list));
    $types_list = @unserialize($wpeft_list);
    foreach ($types_list as $type) {
    	foreach ($type->extensions as $ext) {
            if($ext == $fileext){
                $mime_type = $type->mime_type;
                break 2;
            }
    	}
    }
    $mime_type = $mime_type?$mime_type:"application/octet-stream";
    return $mime_type;
}
$fileext = $_GET['ext'];
echo get_mime_type($fileext);
exit;
}

mime-list.txt（序列化好的数据）：