What are some common pitfalls for beginners learning PHP?

One common pitfall for beginners learning PHP is not properly sanitizing user input, which can leave your application vulnerable to security risks such as SQL injection attacks. To solve this issue, always use functions like mysqli_real_escape_string() or prepared statements to sanitize user input before using it in database queries. 

// Example of sanitizing user input using mysqli_real_escape_string()
$input = $_POST['user_input'];
$clean_input = mysqli_real_escape_string($connection, $input);
$query = "SELECT * FROM users WHERE username='$clean_input'";
$result = mysqli_query($connection, $query);

Keywords

syntax errors variable scope database connections security vulnerabilities debugging techniques

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