How to add/set images on PHPOffice/PHPWord Template?

I have an instance of a template on PHPWord. Is it possible to replace or add an image? Something like a setImageValue?

$phpWord = new PhpOfficePhpWordTemplate('a.docx');
$phpWord->setImageValue('IMAGE_PLACEHOLDER', 'a.jpg');
$phpWord->saveAs('b.docx');

Is something like this possible?

Answer

Following code is the updated version of the one from TotPeRo (thanks again for your code!), for last phpOffice (0.11) that has evolved a little

/**
 * Set a new image
 *
 * @param string $search
 * @param string $replace
 */
public function setImageValue($search, $replace)
{
    // Sanity check
    if (!file_exists($replace))
    {
        return;
    }

    // Delete current image
    $this->zipClass->deleteName('word/media/' . $search);

    // Add a new one
    $this->zipClass->addFile($replace, 'word/media/' . $search);
}

Can be called with:

$document->setImageValue('image1.jpg', 'my_image.jpg');