curl上传注意事项【新】

众所周知，用curl上传只要设置4个变量即可（非HTTPS网站），那就是curlopt_url,curlopt_post,curlopt_returntransfer,curlopt_postfields，当然这4个都是大写。

curlopt_post,curlopt_returntransfer 都是 true，curlopt_url则是你要提交的网址，那么剩下的，curlopt_postfields就是你要上传的内容了。

上传文件在这里也变得非常简单，只需对应的值前面加个“@”即可，如curl_setopt($ch,CURLOPT_POSTFIELDS,array('file'=>'@/var/www/images/abc.jpg')); 文件通过realpath判断后存在的即可。

但是，这一切在php5.6里就发生了改成。php5.6不再支持@这样的上传方式，只能使用curl_file_create的方式来，所以上面的代码要改成

curl_setopt($ch,CURLOPT_POSTFIELDS,array('file'=>curl_file_create('/var/www/images/abc.jpg','image/jpg','abc')));

看看文档里怎么说：

CURLFile should be used to upload a file with CURLOPT_POSTFIELDS.

然后官网的手册中的最后一条评论，仿佛是看不下去，写了个处理上传的程序

There are "@" issue on multipart POST requests.

Solution for PHP 5.5 or later:
- Enable CURLOPT_SAFE_UPLOAD.
- Use CURLFile instead of "@".

Solution for PHP 5.4 or earlier:
- Build up multipart content body by youself.
- Change "Content-Type" header by yourself.

The following snippet will help you :D

<?php

/**
* For safe multipart POST request for PHP5.3 ~ PHP 5.4.
*
* @param resource $ch cURL resource
* @param array $assoc "name => value"
* @param array $files "name => path"
* @return bool
*/
function curl_custom_postfields($ch, array $assoc = array(), array $files = array()) {

// invalid characters for "name" and "filename"
static $disallow = array("\0", "\"", "\r", "\n");

// build normal parameters
foreach ($assoc as $k => $v) {
$k = str_replace($disallow, "_", $k);
$body[] = implode("\r\n", array(
"Content-Disposition: form-data; name=\"{$k}\"",
"",
filter_var($v),
));
}

// build file parameters
foreach ($files as $k => $v) {
switch (true) {
case false === $v = realpath(filter_var($v)):
case !is_file($v):
case !is_readable($v):
continue; // or return false, throw new InvalidArgumentException
}
$data = file_get_contents($v);
$v = call_user_func("end", explode(DIRECTORY_SEPARATOR, $v));
$k = str_replace($disallow, "_", $k);
$v = str_replace($disallow, "_", $v);
$body[] = implode("\r\n", array(
"Content-Disposition: form-data; name=\"{$k}\"; filename=\"{$v}\"",
"Content-Type: application/octet-stream",
"",
$data,
));
}

// generate safe boundary
do {
$boundary = "---------------------" . md5(mt_rand() . microtime());
} while (preg_grep("/{$boundary}/", $body));

// add boundary for each parameters
array_walk($body, function (&$part) use ($boundary) {
$part = "--{$boundary}\r\n{$part}";
});

// add final boundary
$body[] = "--{$boundary}--";
$body[] = "";

// set options
return @curl_setopt_array($ch, array(
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => implode("\r\n", $body),
CURLOPT_HTTPHEADER => array(
"Expect: 100-continue",
"Content-Type: multipart/form-data; boundary={$boundary}", // change Content-Type
),
));
}

好吧，其实多文件上传用这样的方式就挺好。

curl上传注意事项【新】

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