get_posts nur Kinder von bestimmten Eltern

Sie haben zwei Möglichkeiten:

1. Rufen Sieget_postsmehrmals auf:eine für die übergeordneten Seitenmit post__in => array(2,4) und zweifür die untergeordneten Seitenjedes Elternteilsmit post_parent => 2 und post_parent => 4 undführen Sie schließlich alle Ergebnissein einemeinzigen Array zusammen.

2. Schreiben Sie direkt Ihre SQL-Abfrage und verwenden Sie $wpdb->get_results.Siehe diesen Artikel fürein Beispiel.In Ihrem Fall ähnelt dies demfolgenden (nichtgetesteten) 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);
    

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
}
 

Obwohles vieleinfacher/schneller wäre,wenn Sie siein einerbenutzerdefinierten Taxonomiemarkieren oder auf andere Weiseidentifizieren könnten,sodass Sienurnacheiner Sache suchenmüssten,anstattnach drei Dingen.

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

Das wäre weitausflexibler,wenigerfehleranfällig (ID 2 und 4 könnten sich ändern! Kein Hardcode),undesist viel schneller,ohne unformatiertes SQL odermehrere Abfragen. Ganz zu schweigen davon,dass Siejetzteine nettebenutzerfreundliche Benutzeroberflächeim Backend haben,in der Sieeinfacheinen Produktbeitragmarkieren under an der richtigen Stelle angezeigt wird

$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;
}
 

Sie können andere Attribute verwenden (d. h. $child->post_content) ... Wenn Siepost_type definierenmüssen,fügen Sie auch dieses Argument hinzu: &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