Adding pass protection from .htaccess vi

[Anon]

Adding pass protection from .htaccess via PHP, is this possable i tryed to excute command line from php, but no use

<?php
$fp = popen ("htpasswd -c /home/www/.htpasswd http404", "r");
while ($str = fgets ($fp, 9999)){
echo $str;
}
pclose ($fp);

?>