root/trunk/lib/helper/ImageHelper.php

<?php
sfLoader::loadHelpers('I18N');

/**
 * Return an img tag to the flag image of a given coutnry
 *
 * @param  string  $country_code ISO country code
 * @param  mixed   $options
 * @return string
 */
function flag_image_tag($country_code, $options = null)
{
  if (!$country_code)
  {
    return '';
  }

  $options = _parse_attributes($options);

  if (isset($options['class']))
  {
    $options['class'] = trim($options['class']) . ' flag';
  }
  else
  {
    $options['class'] = 'flag';
  }

  $options['alt'] = format_country($country_code);
  $flag_image = sfConfig::get('sf_web_dir').DIRECTORY_SEPARATOR.'images'.DIRECTORY_SEPARATOR.'flags'.DIRECTORY_SEPARATOR.strtolower($country_code).'.png';
  if (!file_exists($flag_image))
  {
    return '';
  }

  return image_tag('flags/'.strtolower($country_code).'.png', $options);
}

/**
 * Returns the application thumb web path
 *
 * @param  Application $application
 * @param  mixed       $options
 * @return string|null
 */
function application_image_tag($application, $options = null)
{
  return image_tag(sprintf('/%s/applications/%s',
                           sfContext::getInstance()->getConfiguration()->getUploadDirName(),
                           $application->getScreenshotPath()), $options);
}

/**
 * Returns the company logo web path
 *
 * @param  Company  $company
 * @param  mixed    $options
 * @return string|null
 */
function company_image_tag($company, $options = null)
{
  return image_tag(sprintf('/%s/companies/%s',
                           sfContext::getInstance()->getConfiguration()->getUploadDirName(),
                           $company->getLogoPath()), $options);
}

/**
 * Returns the person avatar web path. Due to image formats handling, the
 * signature is a bit different regarding the previous *_image_tag functions.
 *
 * @param  sfGuardUser  $person
 * @param  mixed        $options
 * @return string|null
 */
function person_image_tag($person, $format = 'standard', $options = null)
{
  if (!$person->getAvatarPath())
  {
    $config = sfConfig::get('app_people_formats', array());

    if (isset($config[$format]['default']))
    {
      return image_tag(sprintf('/images/%s', $config[$format]['default']), $options);
    }
  }

  return image_tag(sprintf('/%s/people/%s',
                           sfContext::getInstance()->getConfiguration()->getUploadDirName(),
                           $person->getAvatarPath()), $options);
}