Modify function to take start argument and no of pictures

• neodjandre

• October 24, 2017 at 7:40 am

I am using this function to display a gallery thumbnail:

function allphotos_shortcode(){

  $images = get_field('fl_gallery');

  if( $images ) {
      $output .= '<ul id="kalpht">';
      foreach( $images as $image ) :
              $output .= '<li><a class="x-img-link" href="' . $image['url'] .'" data-options="thumbnail:\'' . $image['sizes']['mini-me'] . '\'"><img src="' . $image['sizes']['mini-me'] . '" alt="' . $image['alt'] . '" /></a></li>';
         endforeach;
      $output .= '</ul>' . do_shortcode('[lightbox opacity="0.9" thumbnails="true"]');
}

return $output;
 }

add_shortcode('allphotos', 'allphotos_shortcode');

I am looking to modify it so I can specify in the arguments the starting position and the number of images I want to retrieve.

So for example: [allphotos start=”2″ number=”4″] will start from image 2 and display the next 4 images. “fl_gallery” is a standard ACF gallery field. Any ideas?

• gummi

• October 24, 2017 at 3:36 pm

add_shortcode’s callback accepts 2 parameters. The first one being the attributes and the second on is the body content. https://developer.wordpress.org/reference/functions/add_shortcode/

Then you can use php’s array_slice to to slice the array with a starting index and length. http://php.net/manual/en/function.array-slice.php

So, you callback will look something like this:

function allphotos_shortcode($attrs) {
    $attrs = shortcode_atts([
        'start' => 0,
        'number' => null,
    ], $attrs);

    if (! $images = get_field('fl_gallery')) {
        return '';
    }

    if (! $images = array_slice($images , $attrs['start'], $attrs['number'])) {
        return '';
    }

    $output .= '<ul id="kalpht">';
    foreach ($images as $image) {
        $output .= sprintf(
            '<li><a class="x-img-link" href="%s" data-options="%s">%s</a></li>',
            $image['url'],
            "thumbnail:'{$image['sizes']['mini-me']}'",
            wp_get_attachment_image($image['id'], 'mini-me')
        );
    }
    $output .= '</ul>' . do_shortcode('[lightbox opacity="0.9" thumbnails="true"]');

    return $output;
}

cheers

• neodjandre

• October 26, 2017 at 12:45 am

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