آموزش آپلود فایل در php همراه با امنیت

file_uploads = On

<?php
$upload_dir = "uploads/";
$upload_file = $upload_dir . basename($_FILES["myFile"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($upload_file,PATHINFO_EXTENSION));
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["myFile"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}
?>

if (file_exists($upload_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}

if ($_FILES["myFile"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}

if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}

if ($uploadOk == 0) {
        echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
    } else {
        if (move_uploaded_file($_FILES["myFile"]["tmp_name"], $upload_file)) {
            echo "The file ". basename( $_FILES["myFile"]["name"]). " has been uploaded.";
        } else {
            echo "Sorry, there was an error uploading your file.";
        }
    }