What are the key considerations for ensuring security in a PHP-based Intranet with features like login, calendar, and file uploads?

Key considerations for ensuring security in a PHP-based Intranet with features like login, calendar, and file uploads include implementing secure authentication mechanisms, input validation to prevent SQL injection and XSS attacks, and proper file upload handling to prevent malicious file uploads. 

// Implementing secure authentication mechanism
if(isset($_POST['login'])){
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Perform secure authentication process here
}

// Input validation to prevent SQL injection and XSS attacks
$username = mysqli_real_escape_string($conn, $_POST['username']);
$password = mysqli_real_escape_string($conn, $_POST['password']);

// Proper file upload handling to prevent malicious file uploads
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

// Check if file is an actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        $uploadOk = 1;
    } else {
        $uploadOk = 0;
    }
}

Keywords

PHP Intranet Security Login File uploads

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