删除目录及其中的所有文件或子文件夹

Question

我引用了this link的来源。我的问题是我删除了删除斑马文件夹时不想删除的文件（tiger.jpg）。这是我的directories tree diagram。下面的代码：

Testing.php

include('dbconnect.php');


    $sql="DELETE FROM animal WHERE animal_id='".$_POST['delete_data']."'";

    if(mysqli_query($conn, $sql))  
 {  

     $sql="SELECT * FROM animal WHERE animal_id='".$_POST['delete_data']."'";
     $result=mysqli_query($conn,$sql);
    $row=mysqli_fetch_array($result);
      $animal_name=$row['animal_name'];



function deleteAll($str) {
        //If it's a file.
        if (is_file($str)) {
            //Attempt to delete it.
            return unlink($str);
        }
        //If it's a directory.
        elseif (is_dir($str)) {
            //Get a list of the files in this directory.
            $scan = glob(rtrim($str,'/').'/*');
            //Loop through the list of files.
            foreach($scan as $index=>$path) {
                //Call our recursive function.
                deleteAll($path);
            }
            //Remove the directory itself.
            return @rmdir($str);
        }
    }

    //call our function
    deleteAll("zoo/animal/". $animal_name);


 }

我希望只删除zebra文件夹及其子文件夹和文件，而不会影响任何其他动物文件夹和文件。