Sample of streaming data to a server. - Make sure php://input has not been used first. - Start with this then work it into your code so you know it works. - The client end, should returns small amounts for memory_get_usage even when you have a very large file.

sample.streamfile.php

<?php
echo memory_get_usage() . "\n";

$fileName = "/tmp/postedData";
$f = fopen($fileName, "w");
$s = fopen("php://input", "r");
while($kb = fread($s, 1024)) {
    fwrite($f, $kb, 1024);
}
fclose($f);
fclose($s);

echo memory_get_usage() . "\n";
echo "\n\n";