What are some common pitfalls for beginners when handling form submissions in PHP?

One common pitfall for beginners when handling form submissions in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To solve this issue, always use functions like htmlspecialchars() or mysqli_real_escape_string() to sanitize user input before using it in SQL queries or displaying it on the webpage. 

// Example of sanitizing user input before using it in an SQL query
$name = mysqli_real_escape_string($conn, $_POST['name']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
```

Another common pitfall is not validating user input before processing it, which can result in unexpected behavior or errors. To solve this, always validate user input using functions like filter_var() or regular expressions to ensure it meets the expected format or criteria.

```php
// Example of validating email input before processing it
if (filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
    // Process the email input
} else {
    // Handle invalid email input
}

Keywords

validation security SQL injection CSRF error handling

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