用PHP执行curl [英] Executing Curl with PHP

问题描述

我尝试使用 Docverter 将LaTeX / markdown文件转换为PDF，但使用PHP时遇到问题可通过通过其API访问Docverter 来执行CURL。我知道我不是一个完全白痴b / ci可以得到这个工作适应shell脚本

使用PHP的 exec（）：

  $ url = $ _ SERVER [DOCUMENT_ROOT]; 
 $ file ='/ markdown.md'; 
 $ output = $ url。'/ markdown_to_pdf.pdf'; 
 $ command =curl --form from = markdown \ 
 --form to = pdf \ 
 --form input_files [] = @。$ url。$ file。 \ 
 http://c.docverter.com/convert>。$ output; 
 exec（$ command）; 
  

这不会提供错误消息，但不起作用。

更新基于@ John的建议，下面是一个使用PHP curl_exec（）的例子： 改编自这里。不幸的是，这也不工作，但至少它提供错误消息。

  $ url ='http：//c.docverter .com / convert'; 
 $ fields_string =''; 
 $ fields = array（'from'=>'markdown'，
'至'=>'pdf'，
'input_files []'=> $ _SERVER ['DOCUMENT_ROOT ']。'/ markdown.md'，
）; 
 
 // url-ify POST 
的数据foreach（$ fields为$ key => $ value）{$ fields_string。= $ key。'='。$ value。 '&'; } 
 rtrim（$ fields_string，'&'）; 
 
 //打开连接
 $ ch = curl_init（）; 
 
 //设置url，POST变量的数量，POST数据
 curl_setopt（$ ch，CURLOPT_URL，$ url）; 
 curl_setopt（$ ch，CURLOPT_POST，count（$ fields））; 
 curl_setopt（$ ch，CURLOPT_POSTFIELDS，$ fields_string）; 
 
 //执行post 
 $ result = curl_exec（$ ch）; 
 
 //关闭连接
 curl_close（$ ch）; 
  

解决方案

我解决了自己的问题。上述代码有两个主要问题：

1） $ fields 数组格式不正确， code> input_files [] 。它需要一个 @ / 和mime类型声明（见下面的代码）

2） curl_exec（）输出（实际新创建的文件内容），而不仅仅是 true / false 。这是通过设置curl选项 curl_setopt（$ ch，CURLOPT_RETURNTRANSFER，true）; （见下面的代码）来实现。

完整工作示例

  //设置POST变量
 $ url ='http ：//c.docverter.com/convert'; 
 $ fields = array（'from'=>'markdown'，
'至'=>'pdf'，
'input_files []'=>@ /。 realpath（'markdown.md'）。;; type = text / x-markdown; charset = UTF-8
）; 
 
 //打开连接
 $ ch = curl_init（）; 
 
 //设置选项
 curl_setopt（$ ch，CURLOPT_HTTPHEADER，array（Content-type：multipart / form-data））; 
 curl_setopt（$ ch，CURLOPT_URL，$ url）; 
 curl_setopt（$ ch，CURLOPT_POSTFIELDS，$ fields）; 
 curl_setopt（$ ch，CURLOPT_RETURNTRANSFER，true）; //需要，以便$ result = curl_exec（）输出是文件，不只是true / false 
 
 //执行post 
 $ result = curl_exec（$ ch）; 
 
 //关闭连接
 curl_close（$ ch）; 
 
 //写入文件
 $ fp = fopen（'uploads / result.pdf'，'w'）; //确保目录markdown.md在，并且result.pdf将转到具有适当的权限
 fwrite（$ fp，$ result）; 
 fclose（$ fp）; 
  

I'm trying to use Docverter to convert LaTeX/markdown files to PDF but am having trouble using PHP to do CURL to access Docverter via their API. I'm know I'm not a total idiot b/c i can get this to work adapting the shell script in this Docverter example and running from command line (Mac OSX).

Using PHP's exec():

$url=$_SERVER["DOCUMENT_ROOT"];
$file='/markdown.md';
$output= $url.'/markdown_to_pdf.pdf';
$command="curl --form from=markdown \ 
               --form to=pdf \ 
               --form input_files[]=@".$url.$file." \
               http://c.docverter.com/convert > ".$output;
exec("$command");

This gives no error messages but doesn't work. Is there a path issue somewhere?

UPDATE Based on @John's suggestion, here's an example using PHP's curl_exec() adapted from here. Unfortunately this also doesn't work though at least it gives error messages.

$url = 'http://c.docverter.com/convert';
$fields_string ='';
$fields = array('from' => 'markdown',
        'to' => 'pdf',
        'input_files[]' => $_SERVER['DOCUMENT_ROOT'].'/markdown.md',
    );

    //url-ify the data for the POST
    foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
    rtrim($fields_string, '&');

    //open connection
    $ch = curl_init();

    //set the url, number of POST vars, POST data
    curl_setopt($ch,CURLOPT_URL, $url);
    curl_setopt($ch,CURLOPT_POST, count($fields));
    curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);

    //execute post
    $result = curl_exec($ch);

    //close connection
    curl_close($ch);

解决方案

I solved my own problem. There were two main problems with the above code:

1) The $fields array was incorrectly formatted for the input_files[]. It needed a @/ and mime-type declaration (see code below)

2) The curl_exec() output (the actual newly created file contents) needed to be returned and not just true/false which is this function's default behavior. This is accomplished by setting the curl option curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); (see code below).

Full working example

//set POST variables
$url = 'http://c.docverter.com/convert';
$fields = array('from' => 'markdown',
    'to' => 'pdf',
    'input_files[]' => "@/".realpath('markdown.md').";type=text/x-markdown; charset=UTF-8"
    );

//open connection
$ch = curl_init();

//set options 
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-type: multipart/form-data"));
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //needed so that the $result=curl_exec() output is the file and isn't just true/false

//execute post
$result = curl_exec($ch);

//close connection
curl_close($ch);

//write to file
$fp = fopen('uploads/result.pdf', 'w');  //make sure the directory markdown.md is in and the result.pdf will go to has proper permissions
fwrite($fp, $result);
fclose($fp);

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