bbp_check_for_blacklist( array $anonymous_data = false, int $author_id, string $title = '', string $content = '' )

function bbp_check_for_blacklist( $anonymous_data = false, $author_id = 0, $title = '', $content = '' ) {

	// Allow for blacklist check to be skipped
	if ( apply_filters( 'bbp_bypass_check_for_blacklist', false, $anonymous_data, $author_id, $title, $content ) )
		return true;

	// Bail if keymaster is author
	if ( !empty( $author_id ) && bbp_is_user_keymaster( $author_id ) )
		return true;

	// Define local variable
	$_post = array();

	/** Blacklist *************************************************************/

	// Get the moderation keys
	$blacklist = trim( get_option( 'blacklist_keys' ) );

	// Bail if blacklist is empty
	if ( empty( $blacklist ) )
		return true;

	/** User Data *************************************************************/

	// Map anonymous user data
	if ( !empty( $anonymous_data ) ) {
		$_post['author'] = $anonymous_data['bbp_anonymous_name'];
		$_post['email']  = $anonymous_data['bbp_anonymous_email'];
		$_post['url']    = $anonymous_data['bbp_anonymous_website'];

	// Map current user data
	} elseif ( !empty( $author_id ) ) {

		// Get author data
		$user = get_userdata( $author_id );

		// If data exists, map it
		if ( !empty( $user ) ) {
			$_post['author'] = $user->display_name;
			$_post['email']  = $user->user_email;
			$_post['url']    = $user->user_url;
		}
	}

	// Current user IP and user agent
	$_post['user_ip'] = bbp_current_author_ip();
	$_post['user_ua'] = bbp_current_author_ua();

	// Post title and content
	$_post['title']   = $title;
	$_post['content'] = $content;

	/** Words *****************************************************************/

	// Get words separated by new lines
	$words = explode( "\n", $blacklist );

	// Loop through words
	foreach ( (array) $words as $word ) {

		// Trim the whitespace from the word
		$word = trim( $word );

		// Skip empty lines
		if ( empty( $word ) ) { continue; }

		// Do some escaping magic so that '#' chars in the
		// spam words don't break things:
		$word    = preg_quote( $word, '#' );
		$pattern = "#$word#i";

		// Loop through post data
		foreach ( $_post as $post_data ) {

			// Check each user data for current word
			if ( preg_match( $pattern, $post_data ) ) {

				// Post does not pass
				return false;
			}
		}
	}

	// Check passed successfully
	return true;
}