PHP 把微信生成的图片存入本地

/**
 * 把微信生成的图片存入本地
 *
 * @param [type] $username
 *            [用户名]
 * @param [string] $LocalPath
 *            [要存入的本地图片地址]
 * @param [type] $weixinPath
 *            [微信图片地址]
 *            
 * @return [string] [$LocalPath]失败时返回 FALSE
 */
function save_weixin_img($local_path, $weixin_path)
{
    $weixin_path_a = str_replace("https://", "http://", $weixin_path);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $weixin_path_a);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); //不验证证书
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); //不验证证书
    curl_setopt($ch, CURLOPT_TIMEOUT, 60);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $r = curl_exec($ch);
    curl_close($ch);
    if (! empty($local_path) && ! empty($weixin_path_a)) {
        $msg = file_put_contents($local_path, $r);
    }
    unset($r);
    // 判断头像是否有拉取到 
    if(!getimagesize($local_path)){
        @unlink($local_path);
        $local_path = "";
    }
    return $local_path;
}