使用curl 提交表单（多维数组+文件）数据到服务器的有关问题
使用curl 提交表单（多维数组+文件）数据到服务器的问题
我在本地搭了一个测试服务器，Apache+PHP，想使用curl自动提交表单数据到远程服务器。
远程服务器表单有两项数据需要提交：
1、input file： 要求传图片
2、checkbox： 会有多个按钮被选中
问题：
运行时下面程序时checkbox数组会被转成字符串，程序报错如下：
Array to string conversion
主要代码如下：
$post_url = "http://domain.com/post.php";<br /> $post_data = array(<br /> 'color' => array('red', 'green', 'blue'),<br /> 'img' => "@d:\image.jpg"<br /> );<br /><br /> $ch = curl_init();<br /> curl_setopt($ch, CURLOPT_URL, $post_url);<br /> curl_setopt($ch, CURLOPT_POST, true); <br /> curl_setopt($ch, CURLOPT_POSTFIELDS, ($post_data));<br /> if (false === curl_exec($ch)) {<br /> echo "Curl_error: " . curl_error($ch);<br /> }<br /> curl_close($ch);尝试过：
1、如果用http_build_query处理$post_data，那么color数组就可以正确的传到服务器，但是文件也会被当成一般query参数，从而上传失败。
2、如果不使用http_build_query，文件可以正确上传，但是在服务器抓到color数组的值就是"Array"，并提示"Array to string conversion"错误。
3、我在php.net上看curl手册，发现有个家伙跟我的情况有点类似，但是他使用的是关联数组，所以可以绕弯，类似
$post_data = array("method" => $_POST["method"],<br /> "mode" => $_POST["mode"],<br /> "product[name]" => $_POST["product"], <br /> "product[cost]" => $_POST["product"]["cost"], <br /> "product[thumbnail]" => "@{$_FILES["thumbnail"]["tmp_name"]}");即可解决，可是我的情况是索引数组，模仿他的样子写了之后仍然无效。
请教各位朋友是否知道如何解决？
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