Phpseclib blocked when sftp->get or sftp->put is called - php

Question

I have to monitor the upload and download speed of a Raspberry to an SFTP server.
Such I have to put this data after on a website, at first I thinked to the old library ssh2 of PHP but it didn't send nothing as demanded on the server.
Like Phpseclib exist and seems to be more soft, I have installed Phpseclib on the Raspberry PI by composer. I think that everything is normally installed as some tutorial on website but when I'm using get and put like in the attachment code, CLI command freezes with get.php and give me nothing on the screen and put.php is giving the same time for a file of 1Mo as 512Ko (60 seconds) :/
Do you know how solve this kind of problem ? I had wait 15 min front of the CLI but she seems freezed.
Thanks a lot for your help !
Put.php
`<?php
include '/home/pi/vendor/autoload.php';
$sftp = new \phpseclib\Net\SFTP('192.168.100.20');
$key = new \phpseclib\Crypt\RSA();
$key->loadkey(file_get_contents('/home/pi/.ssh/id_rsa.pub'));
$key->loadkey(file_get_contents( '/home/pi/.ssh/id_rsa'));
if (!$sftp->login('vdar', $key)) {
exit('Login Failed');
}
$start = microtime(true);
$sftp->put('test.txt', str_repeat('a',1024*512));
$elapsed = microtime(true)-$start;
echo "took $elapsed seconds";
?>`
Get.php
`<?php
include '/home/pi/vendor/autoload.php';
define('NET_SFTP_LOGGING', NET_SFTP_LOG_COMPLEX);
$sftp = new \phpseclib\Net\SFTP('192.168.100.20');
$key = new \phpseclib\Crypt\RSA();
$key->loadkey(file_get_contents('/home/pi/.ssh/id_rsa.pub'));
$key->loadkey(file_get_contents( '/home/pi/.ssh/id_rsa'));
if (!$sftp->login('vdar', $key)) {
exit('Login Failed');
}
echo $sftp->pwd() . "\r\n";
$filename='remoteTest.txt';
if($filename)
{
$local_file_path='localTest.txt';
$sftp->get($filename, $local_file_path);
}
else
{
echo "error download files";
}?>`