get output from ssh2_shell

Hi,
I try to use SSH2 in PHP to connect to a linux server. Here is the
code:
<pre>
$connection = ssh2_connect('xxx', 22);
if( !$connection ) die("Failed to connect");

if( ! ssh2_auth_password($connection, 'aaa', 'bbb') )
die("FAIL");

$s = ssh2_shell($connection, "vt100");
if( !$s ) die("Can not attach stdio.");

fwrite($s, "ls /tmp");

$o = fread($s, 100);
echo $o;
</pre>

But I can't get any output using fread. How can I get the
output(STDOUT)?
Any help is appreciated! Thanks in advance.
Have a nice day!

Regards
KEN

.

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