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wp_check_for_changed_dates › WordPress Function

Since4.9.3

已弃用n/a

› wp_check_for_changed_dates ( $post_id, $post, $post_before )

参数: (3)	(int) $post_id Post ID. Required: Yes (WP_Post) $post The post object. Required: Yes (WP_Post) $post_before The previous post object. Required: Yes
定义在:	wp-includes/post.php , line 7055
文档:	developer.wordpress.org / wp_check_for_changed_dates

Checks for changed dates for published post objects and save the old date.

The function is used when a post object of any type is updated, by comparing the current and previous post objects. If the date was changed and not already part of the old dates then it will be added to the post meta field ('_wp_old_date') for storing old dates for that post. The most logically usage of this function is redirecting changed post objects, so that those that linked to an changed post will be redirected to the new post.

源码

function wp_check_for_changed_dates( $post_id, $post, $post_before ) {
	$previous_date = gmdate( 'Y-m-d', strtotime( $post_before->post_date ) );
	$new_date      = gmdate( 'Y-m-d', strtotime( $post->post_date ) );

	// Don't bother if it hasn't changed.
	if ( $new_date == $previous_date ) {
		return;
	}

	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}

	$old_dates = (array) get_post_meta( $post_id, '_wp_old_date' );

	// If we haven't added this old date before, add it now.
	if ( ! empty( $previous_date ) && ! in_array( $previous_date, $old_dates, true ) ) {
		add_post_meta( $post_id, '_wp_old_date', $previous_date );
	}

	// If the new slug was used previously, delete it from the list.
	if ( in_array( $new_date, $old_dates, true ) ) {
		delete_post_meta( $post_id, '_wp_old_date', $new_date );
	}
}