<?php

$binary_data = base64_decode($_POST['image']);
$boundary = uniqid();
$content  = "--$boundary\r\n";
$content .= "content-disposition: form-data; name=\"photo\"; filename=\"my-photo.png\"\r\n";
$content .= "Content-Type: image/png\r\n";
$content .= "Content-Transfer-Encoding: binary\r\n";
$content .= "\r\n";
$content .= "$binary_data\r\n";
$content .= "--$boundary--\r\n";


$context = stream_context_create(array(
    'http' => array(
        'method' => 'POST',
        'header'=> "Content-type: multipart/form-data, boundary=$boundary\r\nContent-Length: " . strlen($content),
        'content' => $content
    )
));

echo(file_get_contents($_POST['serverURL'], false, $context));

?>