teaser.php

<?php /* This part of code displays the teaser for the theme.
       * It accepts some external variables as parameters:
       * Please include this file with
       * require(locate_template('circles.php'));
       * You can set the following variables:
       * $teaser_name: Name of the category containing the teaser posts
       * or
       * $teaser_id: ID of the category containing the news posts
       **/
?>

  <?php
    $teaser_args =  array(
        'post_type' => 'post',
        'post_status' => 'publish',
        'posts_per_page' => -1
        );

    if (isset($teaser_name))
    {
      $teaser_args['category_name'] = $teaser_name;
	  $teaser_id = get_cat_id($teaser_name);
    } else if (isset($teaser_id)) {
      $teaser_args['cat'] = $teaser_id;
    } else {
      $teaser_args['category_name'] = 'teaser';
	  $teaser_id = get_cat_id('teaser');
    }

    $teaser_query = new WP_Query( $teaser_args );

    $imgAvail = false;
    $first_img = false;
    while( $teaser_query->have_posts() ) {
      $teaser_query->the_post();
	  $categories = get_the_category();
	  $show = false;
	  if ($categories)
      {
        foreach ($categories as $category) {
          if ($category->term_id == $teaser_id)
	      {
		    $show = true;
		    break;
		  }
	    }
      }
      $startDate = DateTime::createFromFormat('Ymd', get_field( 'show_start' ));
      $endDate = DateTime::createFromFormat('Ymd', get_field( 'show_end' ));
      $nowDate = new DateTime("now");
      if ($show == true && $startDate <= $nowDate && $nowDate <= $endDate)
      {
        if ($imgAvail == false)
        {
          echo '<div class="flexslider">' . "\n";
          echo '<ul class="slides"> . "\n"';
          $imgAvail = true;
          $first_img = get_field( 'show_image' );
        }
        echo '<li>' . "\n";
        if (strlen(get_field('externer_link')) > 0) {
          echo '<a href="' . get_field('externer_link') . '">' . "\n";
        } else if (!is_null(get_field('link')) && strlen(get_field('link')) > 0) {
          echo '<a href="' . get_field('link') . '">' . "\n";
        }
        echo '<img src="';
        echo the_field( 'show_image' );
        echo '" />' . "\n";
        if ((!is_null(get_field('link')) && strlen(get_field('link')) > 0) ||
          strlen(get_field('externer_link')) > 0) {
          echo '</a>' . "\n";
        }
        echo '</li>' . "\n";
      }
    }

    if ($imgAvail == true)
    {
      echo '</ul></div>' . "\n";
	  if ($first_img !== false)
	  {
	    echo '<noscript><img src="';
        echo the_field( 'show_image' );
        echo '" style="width: 98%" /></noscript>' . "\n";
	  }
    }
  ?>