<?PHP
$img = array
(
1 => array("legend_image" => "chaussete en soie"),
2 => array("legend_image" => "cravate"),
);
print_r($img);
$legend_image = preg_replace('/(&+)/i', '&', $img[1]['legend_image']);// è adapter suivant les images
print "$legend_image";
?>

img = array("legend_image"=> "barratin");
$legend_image = preg_replace('/(&+)/i', '&', $img ['legend_image']);
$image->addChild('caption', $legend_image, 'http://www.google.com/schemas/sitemap-image/1.1');
$image->addChild('title', $legend_image, 'http://www.google.com/schemas/sitemap-image/1.1');