PHP curl submits empty payload

Question

I'm trying to use PHP curl to submit a payload with some files. Here's my submit.php

<?php

$url = "http://example.com/receive.php";

$payload = array();
$payload['resource_name'] = 'hello world';
$payload['resource_file'] = curl_file_create("test-pdf.pdf");

$headr = array();
//$headr[] = 'Content-Type: multipart/form-data';

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headr);
curl_setopt($ch, CURLOPT_POSTFIELDS,http_build_query($payload));

// Receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

curl_close ($ch);
print_r($response);
echo "\n";

And this is my http://example.com/receive.php

<?php
print_r($_REQUEST);
print_r($_FILES);

When I run php submit.php from command line I get this result:

Array
(
    [resource_name] => hello world
    [resource_file] => Array
        (
            [name] => test-pdf.pdf
            [mime] =>
            [postname] =>
        )

)
Array
(
)

Why is my $_FILES array empty?

If I enable the multipart/form-data line, then both $_REQUEST and $_FILES is empty. What am I doing wrong? How do I populate both the $_REQUEST and $_FILES array in receive.php?

There are lots of previous examples of this online - see here. Have you tried anything from your research? stackoverflow.com/questions/21905942/… seems to be the canonical SO answer on this topic. — ADyson
– ADyson, Commented Aug 10, 2021 at 22:24

Rain · Accepted Answer · 2021-08-10 22:37:14Z

1

Remove http_build_query and problem solved.

curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);

The reason is that http_build_query will generate URL-encoded query string for x-www-form-urlencoded

answered Aug 10, 2021 at 22:37

Rain

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