get_posts solo figli di certi genitori

Hai due opzioni:

1. Chiamaget_postspiù volte: unaper lepagineprincipali utilizzando post__in => array(2,4)e dueper lepaginefiglie di ognigenitore con post_parent => 2e post_parent => 4e infine uniscituttii risultatiin un unico array.

2. Scrivi direttamente latua query SQLe utilizza $wpdb->get_results.Consulta questo articolo per unesempio.Neltuo caso sarebbe qualcosa di simile al seguente codice (nontestato):

    $query_sql = "
       SELECT *
       FROM $wpdb->posts
       WHERE post_type = 'products'
       AND (ID IN (2,4) OR post_parent IN (2,4))
       ORDER BY post_date DESC
   ";
   $query_result = $wpdb->get_results($query_sql, OBJECT);
   

You have two options:

1. Call get_posts multiple times: one for the parent pages using post__in => array(2,4), and two for the child pages of each parent with post_parent => 2 and post_parent => 4 and finally merge all the results into a single array.

2. Write directly your SQL query and use $wpdb->get_results. See this article for an example. In your case it would be something similar to the following (not tested) code:

   $query_sql = "
       SELECT *
       FROM $wpdb->posts
       WHERE post_type = 'products'
       AND (ID IN (2,4) OR post_parent IN (2,4))
       ORDER BY post_date DESC
   ";
   $query_result = $wpdb->get_results($query_sql, OBJECT);
   

 $args = array('orderby' => 'date','order' => 'DESC','post_type' => 'products', 'include' => '2, 4');

// get the 2 and 4 posts
$children = get_posts($args);

// get the children of 2, and merge arrays
$children = array_merge($children,get_posts(array('orderby' => 'date','order' => 'DESC','post_type' => 'products','post_parent'=>2)));

// get the children of 4, and merge arrays
$children = array_merge($children,get_posts(array('orderby' => 'date','order' => 'DESC','post_type' => 'products','post_parent'=>4)));

foreach($children as $child){
    // etc
}
 

Anche se sarebbemoltopiùfacile/veloce sepotessitaggarliin unatassonomiapersonalizzata oidentificarliin qualche altromodoin modo chetu debba cercare solo una cosa,invece di 3 cose.

ades. se avessimo unatassonomiapersonalizzata "highlight_products"potremmofare:

 $children = get_posts('post_type' => 'products', 'orderby' => 'date','order' => 'DESC','highlighted_products' => 'example_page');
foreach($children as $child){
    // etc
}
 

Il che sarebbemoltopiùflessibile,meno soggetto aerrori (ID 2e 4potrebbero cambiare! Non codificare),ed èmoltopiù veloce dafare,senza SQLgrezzo o querymultiple. Pernonparlare delfatto che ora hai unabellainterfaccia utentefacile da usarenelback-endin cuitagghi unpost diprodottie apparenelpostogiusto

$args = array('orderby' => 'date','order' => 'DESC','post_type' => 'products', 'include' => '2, 4');

// get the 2 and 4 posts
$children = get_posts($args);

// get the children of 2, and merge arrays
$children = array_merge($children,get_posts(array('orderby' => 'date','order' => 'DESC','post_type' => 'products','post_parent'=>2)));

// get the children of 4, and merge arrays
$children = array_merge($children,get_posts(array('orderby' => 'date','order' => 'DESC','post_type' => 'products','post_parent'=>4)));

foreach($children as $child){
    // etc
}

Although it would be much much easier/faster if you could tag them in a custom taxonomy or identify them some other way so that you were only needing to look for one thing, rather than 3 things.

e.g. if we had a custom taxonomy 'highlighted_products' we might do:

$children = get_posts('post_type' => 'products', 'orderby' => 'date','order' => 'DESC','highlighted_products' => 'example_page');
foreach($children as $child){
    // etc
}

Which would be far more flexible, less prone to errors ( ID 2 and 4 might change! Don't hardcode ), and it's a lot faster to do, no raw SQL or multiple queries. Not to mention that you now have a nice user friendly UI in the backend where you just tag a products post and it appears in the right place

 $children = get_posts('post_parent=SLUG_OF_PARENT_POST&post_status=publish');
foreach($children as $child)
{
echo '<br/>ID:'.$child->ID;
}
 

puoi utilizzare altri attributi (adesempio $child->post_content) ... se devi definirepost_type,aggiungi anche questo argomento: &post_type=POST_TYPE_NAME

$children = get_posts('post_parent=SLUG_OF_PARENT_POST&post_status=publish');
foreach($children as $child)
{
echo '<br/>ID:'.$child->ID;
}

you can use other attributes (i.e. $child->post_content)... if you need to define post_type, then add this argument too : &post_type=POST_TYPE_NAME