What are common mistakes beginners make when creating a PHP contact form?

One common mistake beginners make when creating a PHP contact form is not properly sanitizing user input, which can leave the form vulnerable to SQL injection attacks. To solve this issue, make sure to use functions like mysqli_real_escape_string() or prepared statements to sanitize user input before inserting it into the database. 

// Sanitize user input using mysqli_real_escape_string
$name = mysqli_real_escape_string($conn, $_POST['name']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
$message = mysqli_real_escape_string($conn, $_POST['message']);
```

Another common mistake is not validating user input, which can lead to unexpected errors or data loss. To solve this, use functions like filter_var() to validate email addresses and check for required fields before processing the form data.

```php
// Validate email address
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Invalid email format";
}

// Check for required fields
if (empty($name) || empty($email) || empty($message)) {
    echo "All fields are required";
}

Keywords

PHP contact form validation security error handling

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