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How do I add $tzDesc and $tzEmbed (and other variables) to the $post object in the following function so that I can display the values in my theme files by inserting <?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;

    $numpages = count( $pages );

If you know and can provide an answer can you please be very detailed in how the code should be structured because my knowledge of php is very minimal and I have tried to do this numerous already without any success. Thanks.

share|improve this question

Like any other php object, you can add items to the $post object like so:

$post->my_new_val_name = 'my new value';

I don't know exactly what you're trying to do, but inside a function hooked to the_post, you can assign new values and return the object.

function my_func($post) {

    $post->my_new_val_name = 'my new value';
    return $post;

add_action( 'the_post', 'my_func' );

However, in your template file, you won't be able to just echo $my_new_val_name as you're suggesting... the the_post() function doesn't extract values that way. You'll have to reference the post object explicitly. Like:

echo $post->my_new_val_name;
share|improve this answer
I tried adding $post->$tzEmbed = $custom["slide{$i}-embed"]; to the function above and I got an error: Fatal error: Cannot access empty property in... – matt Dec 7 '10 at 19:09
My bad--had a typo in my answer. Leave the $ off of tzEmbed. Do $post->tzEmbed = $your_var; – MathSmath Dec 7 '10 at 19:33
That kind of worked. I put $post->tzEmbed = $custom["slide{$i}-embed"]; in my functions.php file then <?php echo $post->tzEmbed; ?> in my theme file, however it doesn't echo the correct information. The info is stored in the custom fields and the $i variable designates which one. So it should call from the custom field slide1-embed and slide2-embed... Instead its now displaying the contents of the very last slide (slide4-embed) for every slide. Is there any way to preserve the incremental nature of the $i variable? – matt Dec 7 '10 at 20:26
Again, I'm really not sure exactly what you're doing here, but I guess you could store an array in $post->tzEmbed instead of a single value. Build an array containing each of your slide items, then add the array to the post object. $post->tzEmbed = array('myval1', 'myval2'); Then loop through it on the frontend. In any case, I think I've answered your original question, no? – MathSmath Dec 7 '10 at 21:22
I really do appreciate all your help, but no, I don't believe you have answered my original question: How do I add $tzDesc and $tzEmbed (and other variables) to the $post object in the following function so that I can display the values in my theme files by inserting <?php echo $tzDesc; ?>? because with your answer it doesn't correctly display the values for $tzDesc and $tzEmbed. If you look at my function $tzDesc is defined as $tzDesc = $custom["slide{$i}-desc"]; The $custom variable is getting passed along but for some reason it's losing the $i. – matt Dec 7 '10 at 23:11

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