验证是否允许发表此评论。

原型

wp_allow_comment( array $commentdata, bool $avoid_die = false )

参数

$commentdata (array) (Required) 包含评论的信息。

$avoid_die (bool) (Optional) 如果为true,则不允许的注释将导致函数返回WP_Error对象,而不是执行wp_die()。

返回值

(int|string|WP_Error)  允许的评论返回批准状态(0 | 1 |’垃圾邮件’)。如果

源文件

路径:wp-includes/comment.php

<?php
...
function wp_allow_comment( $commentdata, $avoid_die = 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 );
		if ( true === $avoid_die ) {
			return new WP_Error( 'comment_duplicate', __( 'Duplicate comment detected; it looks as though you&#8217;ve already said that!' ), 409 );
		} else {
			if ( wp_doing_ajax() ) {
				die( __('Duplicate comment detected; it looks as though you&#8217;ve already said that!') );
			}
			wp_die( __( 'Duplicate comment detected; it looks as though you&#8217;ve already said that!' ), 409 );
		}
	}
	/**
	 * Fires immediately before a comment is marked approved.
	 *
	 * Allows checking for comment flooding.
	 *
	 * @since 2.3.0
	 * @since 4.7.0 The `$avoid_die` parameter was added.
	 *
	 * @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   $avoid_die            Whether to prevent 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'],
		$avoid_die
	);
	/**
	 * 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
	 *
	 * @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   $avoid_die            Whether to prevent 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'],
		$avoid_die
	);
	if ( $is_flood ) {
		return new WP_Error( 'comment_flood', __( 'You are posting comments too quickly. Slow down.' ), 429 );
	}
	if ( ! empty( $commentdata['user_id'] ) ) {
		$user = get_userdata( $commentdata['user_id'] );
		$post_author = $wpdb->get_var( $wpdb->prepare(
			"SELECT post_author FROM $wpdb->posts WHERE ID = %d LIMIT 1",
			$commentdata['comment_post_ID']
		) );
	}
	if ( isset( $user ) && ( $commentdata['user_id'] == $post_author || $user->has_cap( 'moderate_comments' ) ) ) {
		// The author and the admins get respect.
		$approved = 1;
	} else {
		// Everyone else's comments will be checked.
		if ( check_comment(
			$commentdata['comment_author'],
			$commentdata['comment_author_email'],
			$commentdata['comment_author_url'],
			$commentdata['comment_content'],
			$commentdata['comment_author_IP'],
			$commentdata['comment_agent'],
			$commentdata['comment_type']
		) ) {
			$approved = 1;
		} else {
			$approved = 0;
		}
		if ( wp_blacklist_check(
			$commentdata['comment_author'],
			$commentdata['comment_author_email'],
			$commentdata['comment_author_url'],
			$commentdata['comment_content'],
			$commentdata['comment_author_IP'],
			$commentdata['comment_agent']
		) ) {
			$approved = EMPTY_TRASH_DAYS ? 'trash' : 'spam';
		}
	}
	/**
	 * Filters a comment's approval status before it is set.
	 *
	 * @since 2.1.0
	 * @since 4.9.0 Returning a WP_Error value from the filter will shortcircuit comment insertion and
	 *              allow skipping further processing.
	 *
	 * @param bool|string|WP_Error $approved    The approval status. Accepts 1, 0, 'spam' or WP_Error.
	 * @param array                $commentdata Comment data.
	 */
	$approved = apply_filters( 'pre_comment_approved', $approved, $commentdata );
	return $approved;
}
...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/wp_allow_comment/