如何添加$tzDesc 和$tzEmbed （和其他变量）到$post 对象，以便通过插入<?php echo $tzDesc; ?>?

add_action( \'the_post\', \'paginate_slide\' );

function paginate_slide( $post ) {

    global $pages, $multipage, $numpages;

    if( is_single() && get_post_type() == \'post\' ) {

    $multipage = 1;
    $id = get_the_ID();
    $custom = array();
    $pages = array();
    $i = 1;

    foreach( get_post_custom_keys() as $key )
        if ( false !== strpos( $key, \'slide\' ) )
            $custom[$key] = get_post_meta( $id, $key, true);

    while( isset( $custom["slide{$i}-title"] ) ) {

        $page = \'\';
        $tzTitle = $custom["slide{$i}-title"];
        $tzImage = $custom["slide{$i}-image"];
        $tzDesc = $custom["slide{$i}-desc"];
        $tzEmbed = $custom["slide{$i}-embed"];

        $page = "<h2>{$tzTitle}</h2><img src=\'{$tzImage}\' />";
        $pages[] = $page;
        $i++;
    }

    $numpages = count( $pages );
    }
}