Are there specific PHP functions or methods that should be avoided when working with form data and databases?

When working with form data and databases in PHP, it is important to avoid using deprecated functions like mysql_ functions, as they are no longer recommended and have security vulnerabilities. Instead, it is recommended to use mysqli_ functions or PDO for interacting with databases, as they provide more secure and flexible options for database operations. 

// Using mysqli_ functions to connect to a database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";

Keywords

SQL injection mysqli_real_escape_string prepared statements htmlspecialchars validation

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