What are some common mistakes to avoid when implementing custom tags and functions in PHP for forum posts?

One common mistake to avoid when implementing custom tags and functions in PHP for forum posts is not properly sanitizing user input. This can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To prevent this, always sanitize and validate user input before using it in your custom tags and functions. 

// Sanitize and validate user input before using it in custom tags and functions
$user_input = $_POST['user_input'];
$sanitized_input = htmlspecialchars(strip_tags(trim($user_input));

// Use the sanitized input in your custom tags and functions
echo "<custom_tag>{$sanitized_input}</custom_tag>";

Keywords

custom tags functions forum posts PHP mistakes

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