ftp_exec

<?php

// variable initialization
$command = 'ls -al >files.txt';

// set up basic connection
$ftp = ftp_connect($ftp_server);

// login with username and password
$login_result = ftp_login($ftp, $ftp_user_name, $ftp_user_pass);

// execute command
if (ftp_exec($ftp, $command)) {
    echo "$command executed successfully\n";
} else {
    echo "could not execute $command\n";
}

// close the connection
ftp_close($ftp);

?>