将循环输出保存到变量中

Question

I have a loop to get a list of terms for a taxonomy.

    <?php 
  $terms = get_field('modell');
  if( $terms ):
    $total = count($terms);
    $count = 1;
    foreach( $terms as $term ):
      ?>
      '<?php echo $term->slug; ?>'
      <?php 
      if ($count < $total) {
        echo ', ';
      }
      $count++;
    endforeach;
  endif; 
?>

The loop output is this:

 'termname-one','termname-two','termname-three' 

Now I want to save this output into variable ($termoutput) and insert it into a array of terms of following loop:

<?php 
query_posts( array(  
    'post_type' => 'posttypename', 
    'posts_per_page' => -1, 
    'orderby' => 'title',
    'order' => 'ASC',
    'tax_query' => array( 
       array( 
          'taxonomy' => 'systems', 
          'field' => 'slug', 
         'terms' => array($termoutput)
       ) 
   ) 

) );    ?>

Is there a way to achive this? Thank you!

Answer 1

You should accumulate your output into an array like this:

$termoutput = array();

...

foreach( $terms as $term ) {
    $termoutput[] = $term->slug;
}

Then, in the second section of your code:

...
'terms' => $termoutput