Are there any common pitfalls to avoid when generating graphical outputs using PHP?

One common pitfall to avoid when generating graphical outputs using PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To prevent this, always validate and sanitize any user input before using it in your graphical outputs. 

// Example of sanitizing user input before using it in graphical outputs
$user_input = $_POST['user_input']; // Assuming user input is coming from a form submission

// Sanitize user input using htmlspecialchars function
$sanitized_input = htmlspecialchars($user_input);

// Now you can safely use $sanitized_input in your graphical outputs
echo "<p>User input: " . $sanitized_input . "</p>";

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