How to delete a file using PHP?

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PHP

Hi,
I want to delete my image file. I use routing system in my project. It consists of the controller and method (function) name and the data is passed. For example:
"http://localhost/MyProject/public/admin/index"

In the code above, admin is controller name and index is the method name. I use this system to carry file information to delete.php.

<a class="dropdown-item" href="<?php echo $root ?>/public/delete/index/<?php echo $myrow['thumb'] ?>">Delete</a>

delete.php:

<?php
class Delete{

    public function index($file){

        $this->DeleteFile($file);
    }
    public function DeleteFile($file){
        
        if(file_exists("/MyProject/public/assets/img/$file")){

            unlink("/MyProject/public/assets/img/$file");
            unlink("/MyProject/public/assets/uploadThumb/$file");
        }else{

            echo "File not exists.";
        }
    }
}

The problem is that the file cannot be deleted and says that the file not exists. My real file address is:

C:\xampp\htdocs\MyProject\public\assets\img\97c584dbaj.jpg

How can I solve this problem?

What I have tried:

<?php
class Delete{

    public function index($file){

        $this->DeleteFile($file);
    }
    public function DeleteFile($file){
        
        if(file_exists("/MyProject/public/assets/img/$file")){

            unlink("/MyProject/public/assets/img/$file");
            unlink("/MyProject/public/assets/uploadThumb/$file");
        }else{

            echo "File not exists.";
        }
    }
}