PHP ssh2 extension testing

Testing script with remote ping

<?php
$connection   = ssh2_connect(<IP_ADDRESS>, <PORT>, ['hostkey' => 'ssh-rsa']);
$authenticate = ssh2_auth_pubkey_file(
    $connection, <USERNAME>,
    "/path/to/.ssh/id_rsa.host.pub",
    "/path/to/.ssh/id_rsa.host"
);

$resultErr = $resultIO  = "";

if ($authenticate) {
    $stream = ssh2_exec($connection, "ping -c 4 -t 15 hk.yahoo.com");

    $streamErr = ssh2_fetch_stream($stream, SSH2_STREAM_STDERR);
    $streamIO  = ssh2_fetch_stream($stream, SSH2_STREAM_STDIO);

    stream_set_blocking($streamErr, true);
    stream_set_blocking($streamIO, true);

    $resultErr = stream_get_contents($streamErr);
    $resultIO  = stream_get_contents($streamIO);

    fclose($streamErr);
    fclose($streamIO);
}else{
    exit("Failed to authenticate");
}

if (empty($resultErr) === true) {
    echo "<h3>Ping</h3>";
    echo "<pre>",$resultIO,"</pre>";
}else{
    echo "<h3>Error</h3>";
    echo "<pre>",$resultErr,"</pre>";
}