What are common issues when using PHP to create comment scripts on websites?

One common issue when using PHP to create comment scripts on websites is the vulnerability to SQL injection attacks if user input is not properly sanitized. To solve this issue, always use prepared statements or parameterized queries to prevent malicious SQL injection attacks. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("INSERT INTO comments (user_id, comment_text) VALUES (:user_id, :comment_text)");
$stmt->bindParam(':user_id', $user_id);
$stmt->bindParam(':comment_text', $comment_text);
$stmt->execute();

Keywords

SQL injection cross-site scripting input validation escaping output security vulnerabilities

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