Add media credit below images in content

gistfile1.phtml

function filter_images($content){
	$original_content = $content;
	$inlineImages = array();
	// Find all images with an ID in content
	preg_match_all( '/wp-image-([^"]*)/i', $content, $inlineImages );

	if ($inlineImages) {
		// For each image build the credit and add to content
		foreach ($inlineImages[1] as $attachment_id) {

		  if ( have_rows('media_credit', $attachment_id ) ) :
		    $image_credit = '<div class="credit">';
		    	while( have_rows( 'media_credit', $attachment_id ) ) : 
		    		the_row();
			      $image_credit .= '<span>';
			      $credit = get_sub_field('credit');
			      $credit_link = get_sub_field('credit_link');
			      
			      // If credit is linked, else just display credit
			      if (!empty($credit_link) && !empty($credit) ) {
			      	$image_credit .= '<a href="'.$credit_link.'">'.$credit.'</a>';
			      } else {
			      	$image_credit .= $credit;
			      }
			      $image_credit .= '</span>';

		      endwhile;

		    $image_credit .= '</div>';

		    // Find image with our ID
				$pattern = "/\<img (.*)wp-image-" . $attachment_id . "(.*)>/";
				// TODO - MATCH IMAGES WRAPPED IN LINKS - MUST FORMAT DIFFERENT
				// $linked_image_pattern = "/<a (.*)><img (.*)wp-image-" . $attachment_id . "(.*)><\/a>/";
				
				// Add credit below image, wrap in <div>
				$new_image = '<div class="media-credit"><img ${1}wp-image-' . $attachment_id . '${2}>' . $image_credit . '</div>';
				
				$content = preg_replace($pattern, $new_image, $content);
		  endif;
		}
	}
	return $content . $original_content;
}
add_filter('the_content', 'filter_images');