/**
* Calculate a perceptual hash of an image string.
*
* @param mixed $data Image data
* @return string
*/
public function hashFromString($data)
{
$resource = $this->createResource($data);
$hash = $this->implementation->hash($resource);
$this->destroyResource($resource);
return $this->formatHash($hash);
}
/**
* Calculate a perceptual hash of an image.
*
* @param mixed $resource
* @param integer $size
* @return integer
*/
public function hash($resource)
{
$destroy = false;
if (!is_resource($resource)) {
$resource = $this->loadImageResource($resource);
$destroy = true;
}
$hash = $this->implementation->hash($resource);
if ($destroy) {
imagedestroy($resource);
}
return $hash;
}
