Add classes to fields in egedal theme

template.php

<?php

/**
 * Implements template_preprocess_field().
 *
 * Adds classes to field based on field name.
 *
 * Good options are:
 * - Field name:    $vars['element']['#field_name'].
 * - Content type:  $vars['element']['#bundle'].
 * - View mode:     $vars['element']['#view_mode'].
 */
function egedal_preprocess_field(&$vars,$hook) {
  // Uncomment next line to print field names.
  // kpr($vars['element']['#field_name']);

  // add class to a specific fields across content types.
  switch ($vars['element']['#field_name']) {
    case 'body':
      $vars['classes_array'][] = 'text-content';
      break;

    case 'field_teaser':
      // Add classes to field without removing old.
      $vars['classes_array'][] = 'text-teaser';
      break;

    case 'field_image':
      // Replace classes entirely, instead of adding extra.
      $vars['classes_array'] = array('title-image');
      break;

    default:
      break;
  }