Analysis of curl upload file version difference problem

=After the front-end post form uploads the file, after the back-end receives the file, it forwards the post to the image server. So I used curl to upload and uploaded using '@file path'

The code is as follows

<?php
    if($_FILES[&#39;video&#39;][&#39;size&#39;]>0){        $data = array('video'=>$_FILES['video']['tmp_name']);         $ch = curl_init();         $url="test.php";
        // 设置URL和相应的选项
        curl_setopt($ch, CURLOPT_URL, $url);
        //启用时会将头文件的信息作为数据流输出。 
        curl_setopt($ch, CURLOPT_HEADER, 0);
        //将curl_exec()获取的信息以字符串返回，而不是直接输出
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);         $res = curl_exec($ch);
        // 抓取URL并把它传递给浏览器
        curl_exec($ch);
        // 关闭cURL资源，并且释放系统资源
        curl_close($ch);

   }

The PHP version of the test machine is 5.2. There is no problem in breaking the code, but putting it on the line Above, the $_FILES variable cannot receive a value. Then observe carefully, I received $_POST['video']='@/tmp/phps12d63'; in $_POST. This is quite strange. The first reaction is that the Content-Type is not transmitted normally, and the Content-Type of the uploaded file should be It is 'multipart/form-data', in this case it should be 'application/x-www-form-urlencoded'. Then print the $_SERVER[‘HTTP_CONTENT_TYPE’] variable on the image server and find that it is ‘multipart/form-data’.
Checking the manual, I found that if the passed parameter of CURLOPT_POSTFIELDS is an array, the Content-Type header will be set to multipart/form-data.
Then there is also a magical CURLOPT_SAFE_UPLOAD parameter, added in php5.5.0, the default value is false, 5.6.0 defaults to true,

CURLOPT_SAFE_UPLOAD
TRUE disables sending files with the @ prefix in CURLOPT_POSTFIELDS. This means @ can be safely used in fields. be usable
CURLFile as a replacement for uploading.

And CURLOPT_POSTFIELDS parameter description

CURLOPT_POSTFIELDS
All data is sent using the "POST" operation in the HTTP protocol. To send a file, prefix the file name with @ and use the full path. The file type can be specified in the format ‘;type=mimetype’ after the file name. This parameter can be a urlencoded string, similar to 'para1=val1¶2=val2&...', or you can use an array with the field name as the key and the field data as the value. If value is an array, the Content-Type header will be set to multipart/form-data. Starting from PHP 5.2.0, when passing files using the @ prefix, value must be an array. Starting with PHP 5.5.0, the @ prefix has been deprecated and files can be sent via CURLFile. Set CURLOPT_SAFE_UPLOAD to TRUE to disable sending files with the @ prefix for added security.

Looking at the version, it turns out that the test environment is php5.3, and the online test environment is 5.6, which means that CURLOPT_SAFE_UPLOAD defaults to true, @ upload is disabled, and @ is an ordinary string. Starting from 5.5, the @ prefix for uploading files has been abandoned. Versions greater than 5.5 need to be uploaded using CURLFile. The final compatible solution uses the @ prefix if it is less than 5.5, and CURLFile if it is greater than 5.5. For versions less than 5.5, use @ to upload and you can add additional parameters; filename = file name; type = mime type

<?php
//curl_file_create是函数的别名CURLFile::__construct() if (!function_exists('curl_file_create')) {
    function curl_file_create($filename, $mimetype = '', $postname = '') {
        return "@$filename;filename="
            . ($postname ?: basename($filename))
            . ($mimetype ? ";type=$mimetype" : '');
    }
}

The final code is

<?php
    if($_FILES[&#39;video&#39;][&#39;size&#39;]>0){        $data = array('video'=>$_FILES['video']['tmp_name']);         $ch = curl_init();         $url="test.php";
        // 设置URL和相应的选项
        curl_setopt($ch, CURLOPT_URL, $url);
        //启用时会将头文件的信息作为数据流输出。 
        curl_setopt($ch, CURLOPT_HEADER, 0);
        //将curl_exec()获取的信息以字符串返回，而不是直接输出
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);        $data['video']=curl_file_create($_FILES['video']['tmp_name'],'video/mp4',$_FILES['video']['name']);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);         $res = curl_exec($ch);
        // 抓取URL并把它传递给浏览器
        curl_exec($ch);
        // 关闭cURL资源，并且释放系统资源
        curl_close($ch);

   }

In conclusion, when encountering a problem, you should analyze it calmly first, and then read the manual carefully.

I encountered a problem on Friday. After the front-end post form uploads a file, after the back-end receives the file, it forwards the post to the image server. So I used curl to upload and uploaded using '@file path'
The code is as follows

<?php
    if($_FILES[&#39;video&#39;][&#39;size&#39;]>0){        $data = array('video'=>$_FILES['video']['tmp_name']);         $ch = curl_init();         $url="test.php";
        // 设置URL和相应的选项
        curl_setopt($ch, CURLOPT_URL, $url);
        //启用时会将头文件的信息作为数据流输出。 
        curl_setopt($ch, CURLOPT_HEADER, 0);
        //将curl_exec()获取的信息以字符串返回，而不是直接输出
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);         $res = curl_exec($ch);
        // 抓取URL并把它传递给浏览器
        curl_exec($ch);
        // 关闭cURL资源，并且释放系统资源
        curl_close($ch);

   }

The PHP version of the test machine is 5.2. There is no problem in breaking the code, but when it is put online, the $_FILES variable is dead or alive. No value received. Then observe carefully, I received $_POST['video']='@/tmp/phps12d63'; in $_POST. This is quite strange. The first reaction is that the Content-Type is not transmitted normally, and the Content-Type of the uploaded file should be It is 'multipart/form-data', in this case it should be 'application/x-www-form-urlencoded'. Then print the $_SERVER[‘HTTP_CONTENT_TYPE’] variable on the image server and find that it is ‘multipart/form-data’.
Check the manual and found that if the passed parameter of CURLOPT_POSTFIELDS is an array, the Content-Type header will be set to multipart/form-data.
Then there is also a magical CURLOPT_SAFE_UPLOAD parameter, added in php5.5.0, the default value is false, 5.6.0 defaults to true,

CURLOPT_SAFE_UPLOAD
TRUE disables sending files with the @ prefix in CURLOPT_POSTFIELDS. This means @ can be safely used in fields. be usable
CURLFile as a replacement for uploading.

And CURLOPT_POSTFIELDS parameter description

CURLOPT_POSTFIELDS
All data is sent using the "POST" operation in the HTTP protocol. To send a file, prefix the file name with @ and use the full path. The file type can be specified in the format ‘;type=mimetype’ after the file name. This parameter can be a urlencoded string, similar to 'para1=val1¶2=val2&...', or you can use an array with the field name as the key and the field data as the value. If value is an array, the Content-Type header will be set to multipart/form-data. Starting from PHP 5.2.0, when passing files using the @ prefix, value must be an array. Starting with PHP 5.5.0, the @ prefix has been deprecated and files can be sent via CURLFile. Set CURLOPT_SAFE_UPLOAD to TRUE to disable sending files with the @ prefix for added security.

查看版本，果然测试环境是php5.3，而线上测试环境是5.6，也是就是说CURLOPT_SAFE_UPLOAD默认为true，禁用了@ 上传，@就是普通字符串了。而从5.5开始@前缀上传文件已经被废弃。大于5.5版本需使用CURLFile 上传。最后兼容方案小于5.5使用@前缀，大于5.5使用CURLFile，在小于5.5的版本是用@上传还可以添加额外的参数；filename=文件名；type=mime类型

<?php
//curl_file_create是函数的别名CURLFile::__construct() if (!function_exists('curl_file_create')) {
    function curl_file_create($filename, $mimetype = '', $postname = '') {
        return "@$filename;filename="
            . ($postname ?: basename($filename))
            . ($mimetype ? ";type=$mimetype" : '');
    }
}

最后代码为

<?php
    if($_FILES[&#39;video&#39;][&#39;size&#39;]>0){        $data = array('video'=>$_FILES['video']['tmp_name']);         $ch = curl_init();         $url="test.php";
        // 设置URL和相应的选项
        curl_setopt($ch, CURLOPT_URL, $url);
        //启用时会将头文件的信息作为数据流输出。 
        curl_setopt($ch, CURLOPT_HEADER, 0);
        //将curl_exec()获取的信息以字符串返回，而不是直接输出
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);        $data['video']=curl_file_create($_FILES['video']['tmp_name'],'video/mp4',$_FILES['video']['name']);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);         $res = curl_exec($ch);
        // 抓取URL并把它传递给浏览器
        curl_exec($ch);
        // 关闭cURL资源，并且释放系统资源
        curl_close($ch);

   }

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