Référence sur les fonctions et paramètres.

• WP_Query
• Custom queries

Nouvelle query standard :

<?php

// The Query
$the_query = new WP_Query( $args );

// The Loop
if ( $the_query->have_posts() ) {
	echo '<ul>';
	while ( $the_query->have_posts() ) {
		$the_query->the_post();
		echo '<li>' . get_the_title() . '</li>';
	}
	echo '</ul>';
	/* Restore original Post Data */
	wp_reset_postdata();
} else {
	// no posts found
}

Récupérer les posts : https://codex.wordpress.org/Template_Tags/get_posts

<?php 
$pages = get_pages();

foreach($pages as $page)
{
   if($page->post_name == 'pineau-pink')
   {
       echo '<div class="item" style="background: url(';
       the_field('image_produits', $page->ID);
       echo ') no-repeat;  background-position: center 0;"></div>';
   }
}

functions.php :

// -----------------------------------------------------------------------------
// Permet de tirer les posts suivant un champs personnalisé
function my_pre_get_posts( $query ) {
    // do not modify queries in the admin
    if( is_admin() ) 
    {
        return $query;
    }
    
    if($query->is_category('products'))
    {
        $query->set('orderby', 'meta_value_num');	
        $query->set('meta_key', 'order');	 
        $query->set('order', 'ASC'); 	
        $query->set('posts_per_page', '-1'); 
    }
    // return
    return $query;
}
add_action('pre_get_posts', 'my_pre_get_posts');

https://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts