Examples:
获取图片、音频、略缩图素材
返回素材的内容,可保存为文件或直接输出
header('Content-type: image/jpg');
list($err, $data) = $api->get_material('BZ-ih-dnjWDyNXjai6i6sdvxOoXOHr9wO0pgMhcZR8g');
echo $data;
获取视频素材
返回带down_url的json字符串
list($err, $data) = $api->get_material('BZ-ih-dnjWDyNXjai6i6sbOICualzdwwnWWBqxW39Xk');
var_dump(json_decode($data));
获取图文素材
返回图文的json字符串
list($err, $data) = $api->get_material('BZ-ih-dnjWDyNXjai6i6sdvxOoXOHr9wO0pgMhcZR8g');
var_dump(json_decode($data));