Question

What I want to do using cURL:

1. Login to my WordPress site, execute my own PHP code and save it to a variable:

   $code_to_execute_remotely = wp_create_nonce(‘my_form’);

   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, ‘www.mywordpresssite.com’);
   curl_setopt($ch, CURLOPT_SOMEMYSTERIOUSFUNCTION, $code_to_execute_remotely);
   $resulting_variable = curl_exec($ch);

2. Then use that variable in a 2nd cURL execution:

   curl_setopt($ch, CURLOPT_MYSECONDFUNCTION, $resulting_variable);
   $second_ececution = curl_exec($ch);
   curl_close($ch);

I’ve used dummy code to simplify things of course. The other functionality (logging into the remote site, etc.) is no problem, just executing that code remotely and returning its results as a usable variable, that’s all I need. Since I’m not terribly familiar w/ cURL, it’s possible I’m attempting something beyond its bounds, in which case I’d be very thankful to know what alternative could achieve this.

Answer 1

On the remote site use the php eval function:

http://php.net/manual/en/function.eval.php

Edit with full explanation:

On your local server:

$post_data['curl_function'] = 'print wp_create_nonce("my_form");'; 
$post_string = http_build_query($post_data); 
curl_setopt($ch, CURLOPT_URL, 'www.mywordpresssite.com/receiver.php');
curl_setopt($ch, CURLOPT_POST, 1); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_string); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch); //This will contain whatever receiver.php prints

On the remote server in receiver.php:

print eval($_POST['curl_function']);

Notes:

• This will only work if you can access the remote server http://www.mywordpresssite.com and upload the receiver.php
• This is very unsafe for the remote server if you don’t sanitize the input and have a way to check so that only your local server can send this request.
• But then again if you can access the remote server why send code through cURl when you can just write the functionality directly in receiver.php?
• So the if you can’t access the remote server then the answer would be; No, you can’t run code through cURL on another server if you want access the remote server and upload files to it.