Question

有两种限制WordPress修订的方法; WP_POST_REVISIONS和wp_revisions_to_keep（）。哪个会有更高的优先级？在阅读完codex之后我无法理解。

Answer 1

WP_POST_REVISIONS是常量，不是函数。如果您设置了WP_POST_REVISIONS，请设置define( 'WP_POST_REVISIONS', 3 );，那么当您调用函数wp_revisions_to_keep时，您将获得3（前提是没有过滤器正在修改该值）。如果未设置WP_POST_REVISIONS，那么它将存储每个修订版本，当您致电-1时，您将获得wp_revisions_to_keep。这是wp_revisions_to_keep的源代码。

/**
 * Determine how many revisions to retain for a given post.
 * By default, an infinite number of revisions are stored if a post type supports revisions.
 *
 * @since 3.6.0
 *
 * @uses post_type_supports()
 * @uses apply_filters() Calls 'wp_revisions_to_keep' hook on the number of revisions.
 *
 * @param object $post The post object.
 * @return int The number of revisions to keep.
 */
function wp_revisions_to_keep( $post ) {
    $num = WP_POST_REVISIONS;

    if ( true === $num )
        $num = -1;
    else
        $num = intval( $num );

    if ( ! post_type_supports( $post->post_type, 'revisions' ) )
        $num = 0;

    return (int) apply_filters( 'wp_revisions_to_keep', $num, $post );
}

由此可见，函数wp_revisions_to_keep()在其中使用了WP_POST_REVISIONS。但是，为了100％确定您建议的修订数量，您应该将函数挂钩到wp_revisions_to_keep。这样的事情： -

add_filter('wp_revisions_to_keep', 'custom_revisions_number', 10, 2);
function custom_revisions_number($num, $post) {
    $num = 5; // <---- change this accordingly.
    return $num; 
}

最高优先级是最后执行的挂钩。

哪种方法优先级更高？

1 个答案: