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Understand the underlying development principles of PHP: security protection and vulnerability repair
In today's Internet era, PHP, as an open source, efficient server-side scripting language, is widely used Used in the field of web development. However, due to its openness and ease of use, it also brings challenges to application security. Understanding the underlying development principles of PHP is very important for developers. In this article, we will focus on PHP security protection and vulnerability repair, with code examples to illustrate.
$name = $_POST['name']; $name = filter_var($name, FILTER_SANITIZE_STRING); // 过滤非法字符
$id = $_GET['id']; $stmt = $pdo->prepare("SELECT * FROM users WHERE id = :id"); $stmt->bindParam(':id', $id); $stmt->execute();
$allowedTypes = ['image/jpeg', 'image/png']; // 允许上传的文件类型 $fileType = $_FILES['file']['type']; if (in_array($fileType, $allowedTypes)) { // 保存文件 } else { echo "Invalid file type!"; }
$username = $_POST['username']; $password = $_POST['password']; // 存储密码 $hashedPassword = password_hash($password, PASSWORD_DEFAULT); // 验证密码 if (password_verify($password, $hashedPassword)) { // 身份验证通过 } else { // 身份验证失败 }
// 错误处理 set_error_handler(function($errno, $errstr, $errfile, $errline) { // 记录错误信息 }); // 日志记录 error_log("An error occurred: " . $message);
Summary:
By understanding the underlying development principles of PHP, we can more fully understand the security protection and vulnerability repair of PHP applications importance. Focusing on input validation and filtering, database security, file upload, user authentication and authorization, error handling and logging, in actual development projects, the rational use of relevant technologies can significantly improve the security of applications and protect users' Privacy and data security.
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