php curl 模拟post上传文件应用实例

php curl 模拟post上传文件应用实例
 
今天工作中遇到一个问题，客户端上传头像，我得到这个$_FILES头像信息，还需要通过模拟表单的type=file方式传递给公司的静态图片地址服务器，并最终从图片服务器拿到图片的绝对地址。
通过思考，实践，确定通过curl模拟表单来进行上传文件;
测试代码如下：
表单：1.html
<form method="POST" action="http://localhost/up.php" enctype="multipart/form-data">
 用户头像：<input type="file" name="image">
 <input type="submit" name="dosubmit">
 </form> 
处理程序：up.php
<?php
 echo "<pre>";
 print_r($_FILES);

 $uploaddir = 'D:/';
 $uploadfile = $uploaddir . basename($_FILES['image']['name']);

 if (move_uploaded_file($_FILES['image']['tmp_name'], $uploadfile)) {
     echo "File is valid, and was successfully uploaded.\n";
 } else {
     echo "Possible file upload attack!\n";
 }
 echo 'Here is some more debugging info:';


 $url = "http://localhost/app.php";
 $data = array(
 "file1"  => "@D:/".$_FILES['image']['name'],    （这里需要注意：不能上传临时地址，而只能是存在的物理绝对路径）
 );
 print_r(uploadByCURL($data,$url));

 function uploadByCURL($post_data,$post_url){
 $curl = curl_init();
 curl_setopt($curl, CURLOPT_URL, $post_url);
 curl_setopt($curl, CURLOPT_POST, 1 );
 curl_setopt($curl, CURLOPT_POSTFIELDS, $post_data);
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($curl,CURLOPT_USERAGENT,"Mozilla/4.0");
 $result = curl_exec($curl);
 $error = curl_error($curl);
 return $error ? $error : $result;
 }
 ?> 
第二次，file提交的处理程序
app.php
<?php
 echo "<pre>";
 print_r($_FILES);$uploaddir = 'e:/';
 $uploadfile = $uploaddir . basename($_FILES['file1']['name']);

 echo '<pre>';
 if (move_uploaded_file($_FILES['file1']['tmp_name'], $uploadfile)) {
     echo "File is valid, and was successfully uploaded.\n";
 } else {
     echo "Possible file upload attack!\n";
 }

 echo 'Here is some more debugging info:';
 ?>通过这三个程序，图片就可以经过两次提交，最终得到图片的地址；