upload.php

<?php
$MAX_FILE_SIZE_IN_MB = 200;
$CHECK_FILE_TYPES = true;
$FILE_TYPES_ALLOWED = array("pdf", "jpg", "jpeg", "png", "gif", "bmp");
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);

if(isset($_POST["submit"])) {
    $uploadOk = 1;
}
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > $MAX_FILE_SIZE_IN_MB * 1024 * 1024) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($CHECK_FILE_TYPES && !in_array(strtolower($imageFileType), $FILE_TYPES_ALLOWED)) {
    echo "Sorry, this file type is not allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        $filepath = basename( $_FILES["fileToUpload"]["name"]) 
        echo "The file <a href=\"" . $filepath . "\">" . $filepath . "</a> has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>