php curl upload file

Assume that the server-side upload file processing script upload.php:

<?php
 
print_r($_POST);
print_r($_FILES);
？>

1. Use the CURL default method

//如果php文件是utf8编码，系统是GBK编码，那么就需要转下编码，要不然Php在系统中找不到这个文件 
$file = realpath(mb_convert_encoding('测试图片.JPG','GBK','utf8'));
 
$file = realpath('temp.jpg'); //要上传的文件 
$fields['f'] = '@'.$file; // 前面加@符表示上传图片
 
$ch =curl_init();
 
 
curl_setopt($ch,CURLOPT_URL,'http://localhost/upload.php');
 
curl_setopt($ch,CURLOPT_POST,true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
 
 
$content = curl_exec($ch);
 
echo $content;

2. An alternative approach, sometimes we need to treat dynamically generated content as a file Upload to a remote server but don't want to build temporary files in the local server. This way we have this alternative way of writing

$contents =<<< &#39;TEXT&#39;
这里是文件内容，也可以是图片二进制，图片需要修改上传文件类型
TEXT;
 
$varname = &#39;my&#39;;//上传到$_FILES数组中的 key
$name = &#39;3.txt&#39;;//文件名
$type = &#39;text/plain&#39;;//文件类型
 
$key = "$varname\"; filename=\"$name\r\nContent-Type: $type\r\n";
$fields[$key] = $contents;
 
 
 
$ch =curl_init();
 
 
curl_setopt($ch,CURLOPT_URL,&#39;http://localhost/upload.php&#39;);
 
curl_setopt($ch,CURLOPT_POST,true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
 
 
$content = curl_exec($ch);
 
echo $content;