如果语句来过滤文件扩展名

Question

我正在创建一个脚本，该脚本允许用户上传图像，但是现在我想包含一个简单的if语句，该语句仅接受gif和png。这是我的代码，但似乎无法正常工作。

#extention filter
$allowed = array("image/gif","image/png");  
if(!in_array($files,$allowed)){
 $error_message = 'Only jpg, gif, and pdf files are allowed.';
  $error = 'yes';
  echo $error_message;
  exit();
}   #extention

Answer 1

    $filename=$_FILE['name']['filename_in_html'];  //you can change this with your filename
    $allowed='png,jpg';  //which file types are allowed seperated by comma

    $extension_allowed=  explode(',', $allowed);
    $file_extension=  pathinfo($filename, PATHINFO_EXTENSION);
    if(array_search($file_extension, $extension_allowed))
    {
        echo "$extension_allowed allowed for uploading file";
    }
    else
    {
        echo "$extension_allowed is not allowed for uploading file";
    }