author_can - Documentation

WordPress Version: 5.3

/**
 * Returns whether the author of the supplied post has the specified capability.
 *
 * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
 * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
 * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
 *
 * Example usage:
 *
 *     author_can( $post, 'edit_posts' );
 *     author_can( $post, 'edit_post', $post->ID );
 *     author_can( $post, 'edit_post_meta', $post->ID, $meta_key );
 *
 * @since 2.9.0
 * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
 *              by adding it to the function signature.
 *
 * @param int|WP_Post $post       Post ID or post object.
 * @param string      $capability Capability name.
 * @param mixed       ...$args    Optional further parameters, typically starting with an object ID.
 * @return bool Whether the post author has the given capability.
 */
function author_can($post, $capability, ...$args)
{
    $post = get_post($post);
    if (!$post) {
        return false;
    }
    $author = get_userdata($post->post_author);
    if (!$author) {
        return false;
    }
    return $author->has_cap($capability, ...$args);
}

WordPress Version: 4.9

/**
 * Whether the author of the supplied post has a specific capability.
 *
 * @since 2.9.0
 *
 * @param int|WP_Post $post       Post ID or post object.
 * @param string      $capability Capability name.
 * @return bool Whether the post author has the given capability.
 */
function author_can($post, $capability)
{
    if (!$post = get_post($post)) {
        return false;
    }
    $author = get_userdata($post->post_author);
    if (!$author) {
        return false;
    }
    $args = array_slice(func_get_args(), 2);
    $args = array_merge(array($capability), $args);
    return call_user_func_array(array($author, 'has_cap'), $args);
}

WordPress Version: 3.7

/**
 * Whether author of supplied post has capability or role.
 *
 * @since 2.9.0
 *
 * @param int|object $post Post ID or post object.
 * @param string $capability Capability or role name.
 * @return bool
 */
function author_can($post, $capability)
{
    if (!$post = get_post($post)) {
        return false;
    }
    $author = get_userdata($post->post_author);
    if (!$author) {
        return false;
    }
    $args = array_slice(func_get_args(), 2);
    $args = array_merge(array($capability), $args);
    return call_user_func_array(array($author, 'has_cap'), $args);
}