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PHP HTTP POST images & files

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The following are instructions to "re-post" files that have been already been POSTed to your php script. This can help if you want to have a form (with file upload) that POSTs its data to your own script where the text elements can be handled and then the script POSTs the file for processing/storage on another system.

Basically the key is that you only POST the `$_FILES['tmp_name']` with an "@" symbol prepended.

Spent a good hour trying to figure this out. Thanks to gordon who posted on 08-Sep-2004 10:08 at http://theserverpages.com/php/manual/en/ref.curl.php

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Copy this code and paste it in your HTML 
  1. <?php
  2. $url = ''; // the url of the file processing script (ie, http://example.com/upload)
  3.  
  4. // Iterate through each file, check it has been stored in a tmp location, then post to another url
  5. foreach ($_FILES as $file) {
  6.   // tmp_name will look something like this /private/var/tmp/phpRDJDT92
  7.   if ($file['tmp_name'] > '') {
  8.     $params['file'] = '@'.$file['tmp_name']; // Its this @ symbol thats the key.
  9.     $response = post($url, $params);
  10.   }
  11. }
  12.  
  13. function post($url, $params = array()) {
  14.   try {
  15.     $response = http_post($url, $params);
  16.     return $response;
  17.   } catch (Exception $e) {
  18.     return null;
  19.   }
  20. }
  21.  
  22. // More REST methods available at http://snipplr.com/view/19781/php-rest/
  23. // Nothing special about this cURL POST. You dont have to set any special headers for file uploading.
  24. function http_post($url, $data) {
  25.   $c = curl_init();
  26.   curl_setopt($c, CURLOPT_URL, $url);
  27.   curl_setopt($c, CURLOPT_POST, 1);
  28.   curl_setopt($c, CURLOPT_SSL_VERIFYPEER, true);
  29.   curl_setopt($c, CURLOPT_POSTFIELDS, $data);
  30.   curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
  31.   $output = curl_exec($c);
  32.   curl_close($c);
  33.   return $output;
  34. }
  35. ?>

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