How to programatically HTTP POST a CSV file directly from an array in PHP?

Intreesting question. The only thing I can think of is that you echo the "csv data" with headers of a post and that it's a csv file. That should not create a file on the server afaik. Not sure fully how to approach it, but if you run set apache headers or whichever server system you're using. Give it a shot and let me know if it works.

I managed to capture the csv data in to a variable using fputcsv to php://output with output buffering. Since the service only allows multipart format for the submission, you need to construct the payload like this.

<?php//Construct your csv data$celldata = array(    array(        "heading1",        "heading2",        "heading3",    ),    array(        1,        2,        3,    ),    array(        4,        5,        6,    ));//Output to php://outputob_start();$outstream = fopen("php://output", 'w');foreach($celldata as $cell) {    fputcsv($outstream, $cell);}   fclose($outstream) or die();$csv_data = ob_get_clean();$url = 'http://opencellid.org/measure/uploadCsv';// Taken from http://stackoverflow.com/questions/3085990/post-a-file-string-using-curl-in-php// form field separator$delimiter = '-------------' . uniqid();// file upload fields: name => array(type=>'mime/type',content=>'raw data')$fileFields = array(    'datafile' => array(        'type' => 'text/plain',        'content' => $csv_data,    ),);// all other fields (not file upload): name => value$postFields = array(    'key'   => 'opencellidapikey', //Put your api key here);$data = '';// populate normal fields first (simpler)foreach ($postFields as $name => $content) {    $data .= "--" . $delimiter . "\r\n";    $data .= 'Content-Disposition: form-data; name="' . $name . '"';    $data .= "\r\n\r\n";    $data .= $content;    $data .= "\r\n";}// populate file fieldsforeach ($fileFields as $name => $file) {    $data .= "--" . $delimiter . "\r\n";    $data .= 'Content-Disposition: form-data; name="' . $name . '";' .             ' filename="' . $name . '"' . "\r\n";    $data .= 'Content-Type: ' . $file['type'] . "\r\n";    $data .= "\r\n";    $data .= $file['content'] . "\r\n";}$data .= "--" . $delimiter . "--\r\n";$handle = curl_init($url);curl_setopt($handle, CURLOPT_POST, true);curl_setopt($handle, CURLOPT_HTTPHEADER , array(    'Content-Type: multipart/form-data; boundary=' . $delimiter,    'Content-Length: ' . strlen($data)));  curl_setopt($handle, CURLOPT_POSTFIELDS, $data);curl_setopt($handle, CURLOPT_RETURNTRANSFER,1);$result = curl_exec($handle);var_dump($result);

I get API key error, but it should work.