wp_allow_comment() │ WP 2.0.0

Checks whether the comment can be published based on the provided comment data or if it needs to be sent for review or marked as spam.

  • Terminates the script using wp_die() if a duplicate comment is found and $wp_error=false (by default).

  • Returns 1 (comment confirmed) if the comment author has the right moderate_comments or is the author of the commented post.
Uses: check_comment(), wp_blacklist_check()
Hooks from the function

Returns

Int|String|WP_Error. Indicates whether the comment is allowed or not: 0 - not allowed, 1 - comment confirmed or 'spam' - spam.

Usage

wp_allow_comment( $commentdata, $wp_error );
$commentdata(array) (required)
Array of comment data. This array is usually passed to the function wp_insert_comment()
$wp_error(boolean) (WP 4.7)
true = do not execute wp_die(), but return WP_Error in case of an error.
Default: false

Examples

1

#1 Demo

Example from the function wp_new_comment().

$commentdata['comment_approved'] = wp_allow_comment( $commentdata );

$done = wp_insert_comment( $commentdata );

if( $done ){
	// Comment added to the database
}

/*
Within wp_insert_comment() such check is triggered:

if ( $comment_approved == 1 ) {
	wp_update_comment_count( $comment_post_ID );
}

This means that the comment will in any case be written to the database,
but with a status that will return wp_allow_comment() and if it
is confirmed, i.e. equals 1, then the number of post comments will be updated.
*/

Notes

  • Global. wpdb. $wpdb WordPress database abstraction object.

Changelog

Since 2.0.0 Introduced.
Since 4.7.0 The $avoid_die parameter was added, allowing the function to return a WP_Error object instead of dying.
Since 5.5.0 The $avoid_die parameter was renamed to $wp_error.

wp_allow_comment() code WP 6.9.1

wp-includes/comment.php 
function wp_allow_comment( $commentdata, $wp_error = false ) {
	global $wpdb;

	/*
	 * Simple duplicate check.
	 * expected_slashed ($comment_post_ID, $comment_author, $comment_author_email, $comment_content)
	 */
	$dupe = $wpdb->prepare(
		"SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_parent = %s AND comment_approved != 'trash' AND ( comment_author = %s ",
		wp_unslash( $commentdata['comment_post_ID'] ),
		wp_unslash( $commentdata['comment_parent'] ),
		wp_unslash( $commentdata['comment_author'] )
	);
	if ( $commentdata['comment_author_email'] ) {
		$dupe .= $wpdb->prepare(
			'AND comment_author_email = %s ',
			wp_unslash( $commentdata['comment_author_email'] )
		);
	}
	$dupe .= $wpdb->prepare(
		') AND comment_content = %s LIMIT 1',
		wp_unslash( $commentdata['comment_content'] )
	);

	$dupe_id = $wpdb->get_var( $dupe );

	/**
	 * Filters the ID, if any, of the duplicate comment found when creating a new comment.
	 *
	 * Return an empty value from this filter to allow what WP considers a duplicate comment.
	 *
	 * @since 4.4.0
	 *
	 * @param int   $dupe_id     ID of the comment identified as a duplicate.
	 * @param array $commentdata Data for the comment being created.
	 */
	$dupe_id = apply_filters( 'duplicate_comment_id', $dupe_id, $commentdata );

	if ( $dupe_id ) {
		/**
		 * Fires immediately after a duplicate comment is detected.
		 *
		 * @since 3.0.0
		 *
		 * @param array $commentdata Comment data.
		 */
		do_action( 'comment_duplicate_trigger', $commentdata );

		/**
		 * Filters duplicate comment error message.
		 *
		 * @since 5.2.0
		 *
		 * @param string $comment_duplicate_message Duplicate comment error message.
		 */
		$comment_duplicate_message = apply_filters( 'comment_duplicate_message', __( 'Duplicate comment detected; it looks as though you’ve already said that!' ) );

		if ( $wp_error ) {
			return new WP_Error( 'comment_duplicate', $comment_duplicate_message, 409 );
		} else {
			if ( wp_doing_ajax() ) {
				die( $comment_duplicate_message );
			}

			wp_die( $comment_duplicate_message, 409 );
		}
	}

	/**
	 * Fires immediately before a comment is marked approved.
	 *
	 * Allows checking for comment flooding.
	 *
	 * @since 2.3.0
	 * @since 4.7.0 The `$avoid_die` parameter was added.
	 * @since 5.5.0 The `$avoid_die` parameter was renamed to `$wp_error`.
	 *
	 * @param string $comment_author_ip    Comment author's IP address.
	 * @param string $comment_author_email Comment author's email.
	 * @param string $comment_date_gmt     GMT date the comment was posted.
	 * @param bool   $wp_error             Whether to return a WP_Error object instead of executing
	 *                                     wp_die() or die() if a comment flood is occurring.
	 */
	do_action(
		'check_comment_flood',
		$commentdata['comment_author_IP'],
		$commentdata['comment_author_email'],
		$commentdata['comment_date_gmt'],
		$wp_error
	);

	/**
	 * Filters whether a comment is part of a comment flood.
	 *
	 * The default check is wp_check_comment_flood(). See check_comment_flood_db().
	 *
	 * @since 4.7.0
	 * @since 5.5.0 The `$avoid_die` parameter was renamed to `$wp_error`.
	 *
	 * @param bool   $is_flood             Is a comment flooding occurring? Default false.
	 * @param string $comment_author_ip    Comment author's IP address.
	 * @param string $comment_author_email Comment author's email.
	 * @param string $comment_date_gmt     GMT date the comment was posted.
	 * @param bool   $wp_error             Whether to return a WP_Error object instead of executing
	 *                                     wp_die() or die() if a comment flood is occurring.
	 */
	$is_flood = apply_filters(
		'wp_is_comment_flood',
		false,
		$commentdata['comment_author_IP'],
		$commentdata['comment_author_email'],
		$commentdata['comment_date_gmt'],
		$wp_error
	);

	if ( $is_flood ) {
		/** This filter is documented in wp-includes/comment-template.php */
		$comment_flood_message = apply_filters( 'comment_flood_message', __( 'You are posting comments too quickly. Slow down.' ) );

		return new WP_Error( 'comment_flood', $comment_flood_message, 429 );
	}

	return wp_check_comment_data( $commentdata );
}

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