readdir() in php

<?php
//Open send directory

if(@$dir = opendir("send"))

{//List files in send directory

while (($file = readdir($dir)) !== false)

{

echo "filename: ". $file ."<br />";

}

closedir($dir);

}

else

{

echo 'directory not opened';

}

?>

outputs :
 1)
directory not opened

2)
filename: .
filename: ..
filename: sendsms.html
filename: sendsms.php
filename: send_vard.php
filename: send_vcard_sms.html
filename: smser.php