In addition to the last post from Ricardo Striquer:
Simple block the stream with stream_set_blocking(), and you dont have to sleep() the script...
<?php
stdout_stream = ssh2_exec($connection, "/bin/lssss -la /tmp");
$err_stream = ssh2_fetch_stream($stdout_stream, SSH2_STREAM_STDERR);
$dio_stream = ssh2_fetch_stream($stdout_stream, SSH2_STREAM_STDDIO);
stream_set_blocking($err_stream, true);
stream_set_blocking($dio_stream, true);
$result_err = stream_get_contents($err_stream));
$result_dio = stream_get_contents($dio_stream));
?>
