Question

I am connected to the server via the PHP ftp_ functions.

How can I measure the transfer speed?

Answer 1

This is how I brutalized the phihag’s code to check non-blocking upload speed. You can’t use ftp_size() while non-blocking transfer is ongoing, therefore you need a secondary connection just for that purpose. I’m displaying current speed, average speed, elapsed time and estimated time left.

$primary_connection = ftp_connect($server);
$secondary_connection = ftp_connect($server);

$mode = FTP_BINARY;
$login = ftp_login($primary_connection, $ftp_user_name, $ftp_user_pass);
$login2 = ftp_login($secondary_connection, $ftp_user_name, $ftp_user_pass);

if (!$primary_connection || !$login) { die('Connection attempt failed!'); }
ftp_pasv($primary_connection,TRUE);
ftp_pasv($secondary_connection,TRUE);

$upload_status=ftp_nb_put($primary_connection, $destination_file, $source_file, $mode);

define('ALPHA', 0.2); // Weight factor of new calculations, between 0 and 1
$filesize=filesize($source_file);
$transferred = 0;
$rate = 0;
$time = microtime(true);

$start_time=$time;

while($upload_status == FTP_MOREDATA){

    $upload_status = ftp_nb_continue($primary_connection);

    $sizeNow=ftp_size($secondary_connection,$destination_file);
    $sizeNowkB=$sizeNow/1024;
    $timeNow = microtime(true);

    $currentRate = ($sizeNow - $transferred) / ($timeNow - $time);
    $currentkBRate = $currentRate / 1024;

    $rate = ALPHA * $currentRate + (1 - ALPHA) * $rate;
    $time = $timeNow;
    $transferred = $sizeNow;

    printf("Uploading file: %s",$source_file);
    echo "<br>\n";

    printf( "To be transferred: %0.2f kB", $filesize/1024);
    echo "<br>\n";

    printf( "Transferred: %0.2f kB", $sizeNowkB);
    echo "<br>\n";

    printf( "Current speed: %0.2f kB/s", $currentkBRate);
    echo "<br>\n";

    printf( "Average speed: %0.2f kB/s", $rate/1024);
    echo "<br>\n";

    $elapsed_time=$timeNow - $start_time;
    printf( "Elapsed time: %0.2f s", $elapsed_time);
    echo "<br>\n";

    if($rate!=0){
        $eta=$filesize/$rate - $elapsed_time;
    }else{
        $eta=0.0;
    }
    if($eta<=0){
        $eta=0.0;
    };
    printf( "Estimated time left: %0.2f s", $eta);
    echo "<br>\n";

}