/**
* @param string $alt
* @return null
*/
public function setAlt($alt)
{
if (!isset($this->loadedFields['alt'])) {
$this->loadProperties();
}
$oldValue = null;
if (array_key_exists('alt', $this->loadedValues)) {
$oldValue = $this->loadedValues['alt'];
}
if ($oldValue === $alt) {
$this->alt = $alt;
return;
}
return parent::setAlt($alt);
}
