<?php
session_start();
echo $random_name= $_SESSION['upload_id'];
    ?>

   <form action="uploader_file.php" method="post" enctype="multipart/form-data">
        <label for="fileSelect">Filename:</label>
        <input type="file" name="photo" id="fileSelect">
        <input type="submit" name="submit" value="Upload">
        <p><strong>Note:</strong> Only .pdf allowed to a max size of 5 MB.</p>
    </form>

<?php

// Check if the form was submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){

    // Check if file was uploaded without errors
    if(isset($_FILES["photo"]) && $_FILES["photo"]["error"] == 0){
        $allowed = array("pdf" => "application/pdf");
        $filename = $_FILES["photo"]["name"];
        $filetype = $_FILES["photo"]["type"];
        $filesize = $_FILES["photo"]["size"];

        // Verify file extension
        $ext = pathinfo($filename, PATHINFO_EXTENSION);
        if(!array_key_exists($ext, $allowed)) die("Error: Please select a valid file format.");

        // Verify file size - 5MB maximum
        $maxsize = 5 * 1024 * 1024;
        if($filesize > $maxsize) die("Error: File size is larger than the allowed limit.");

        // Verify MYME type of the file
        if(in_array($filetype, $allowed)){
            // Check whether file exists before uploading it
            if(file_exists("../download/" . $filename)){
                echo $filename . " is already exists.";
            } else{
                move_uploaded_file($_FILES["photo"]["tmp_name"], "../download/upload/" . $filename);
                echo "Your file was uploaded successfully.";
            }
        } else{
            echo "Error: There was a problem uploading your file. Please try again.";
        }
    } else{
        echo "Error: " . $_FILES["photo"]["error"];
    }
}
?>