<?php
$target_url = "https://www.yourdomain.co.uk/acceptupload.php";
$file_name_with_full_path = "/tmp/4mb-test-file";
while(true) {
        $time_start = microtime(true);
        $cFile = curl_file_create($file_name_with_full_path);
        $post = array('upload_file'=>$cFile);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,$target_url);
        curl_setopt($ch, CURLOPT_POST,1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $result=curl_exec ($ch);
        curl_close ($ch);
        if($result == "OK") {
                echo date("Y-m-d H:i:s")."\t";
                $time_end = microtime(true);
                $download_time = $time_end - $time_start;
                echo $download_time."\t";
                echo (4/$download_time)."\n";
                sleep(60);
        } else {
                echo "Error downloading ($result)\n";
        }
}

?>