Make directory and upload multiple file into created directory PHP

I have been digging for an answer for many days. how do i upload multiple file to the newly created directory. If you look into file_upload.php you will find two $upload_dir variable. So, let's call first $upload_dir as direct folder and Second, $upload_dir as make dir. Simple

So, When I select first $upload_dir it does upload all files directly into the folder and When I select second $upload_dir what it does is create a random folder but unable to upload any file.

I want to upload multiple file into newly created folder

I did refer this PHP - Upload multiple photos into newly created Directory and Multiple file upload and store them in a directory but didn't work for me

index.php

<form action="file_upload.php" method="POST"
            enctype="multipart/form-data"> 
  
        <h2>Upload Files</h2> 
          
        <p> 
            Select files to upload:  
              
            <!-- name of the input fields are going to 
                be used in our php script-->
            <input type="file" name="files[]" multiple> 
              
            <br><br> 
              
            <input type="submit" name="submit" value="Upload" > 
        </p> 
    </form>  

file_upload.php

<?php  
  
// session_start();
// Check if form was submited 
if(isset($_POST['submit'])) { 
  
    // Configure upload directory and allowed file types 
    $rand_name = rand(1, 10000);
    // $upload_dir = 'C:/fileUpload/'.DIRECTORY_SEPARATOR;
    // $permit = 0777;
    $allowed_types = array('jpg', 'png', 'jpeg', 'gif'); 
    $upload_dir = mkdir('C:/fileUpload/'. $rand_name .'/'.DIRECTORY_SEPARATOR, 0777);
      
    // Define maxsize for files i.e 10MB 
    $maxsize = 10 * 1024 * 1024;  
  
    // Checks if user sent an empty form  
    if(!empty(array_filter($_FILES['files']['name']))) { 
  
        // Loop through each file in files[] array 
        foreach ($_FILES['files']['tmp_name'] as $key => $value) { 
              
            $file_tmpname = $_FILES['files']['tmp_name'][$key]; 
            $file_name = $_FILES['files']['name'][$key]; 
            $file_size = $_FILES['files']['size'][$key]; 
            $file_ext = pathinfo($file_name, PATHINFO_EXTENSION); 
  
            // Set upload file path 
            $filepath = $upload_dir.$file_name;
  
            // Check file type is allowed or not 
            if(in_array(strtolower($file_ext), $allowed_types)) { 
  
                // Verify file size - 10MB max  
                if ($file_size > $maxsize)          
                    echo "Error: File size is larger than the allowed limit.";  
  
                // If file with name already exist then append time in 
                // front of name of the file to avoid overwriting of file 
                if(file_exists($filepath)) { 
                    $filepath = $upload_dir.time().$file_name; 
                      
                    if( move_uploaded_file($file_tmpname, $filepath)) { 
                        echo "{$file_name} successfully uploaded <br />"; 
                    }  
                    else {                      
                        echo "Error uploading {$file_name} <br />";  
                    } 
                } 
                else { 
                  
                    if( move_uploaded_file($file_tmpname, $filepath)) { 
                        echo "{$file_name} successfully uploaded <br />"; 
                    } 
                    else {                      
                        echo "Error uploading {$file_name} <br />";  
                    } 
                } 
            } 
            else { 
                  
                // If file extention not valid 
                echo "Error uploading {$file_name} ";  
                echo "({$file_ext} file type is not allowed)<br / >"; 
            }  
        } 
    }  
    else { 
          
        // If no files selected 
        echo "No files selected."; 
    } 
}  
  
?> 

Please Help!

Thank you in Advance

mkdir returns a boolean (true or false), not the created directory path.

You probably want to define the path in $upload_dir but not assign the result of the mkdir to it:

$upload_dir = 'C:/fileUpload/'. $rand_name .'/';

if (mkdir($upload_dir, 0777)) {
   //process images
}