How can PHP developers prevent spam and irrelevant posts on forums?

To prevent spam and irrelevant posts on forums, PHP developers can implement CAPTCHA verification, require user registration before posting, utilize moderation tools to approve posts before they are published, and implement keyword filtering to flag suspicious content. 

// Example PHP code snippet for implementing CAPTCHA verification
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if ($_POST["captcha"] != $_SESSION["captcha"]) {
        // CAPTCHA verification failed, handle accordingly (e.g. display error message)
    } else {
        // CAPTCHA verification passed, process the post
    }
}

// Generate a random CAPTCHA code and store it in the session
$captcha = substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, 6);
$_SESSION["captcha"] = $captcha;

// Display the CAPTCHA image in the form
echo '<img src="captcha.php" alt="CAPTCHA">';
echo '<input type="text" name="captcha" placeholder="Enter CAPTCHA code">';

Keywords

CAPTCHA Akismet honeypot content moderation IP blocking

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