How can PHP scripts be optimized to handle concurrent access to an FTP server by multiple users?

To optimize PHP scripts to handle concurrent access to an FTP server by multiple users, you can implement locking mechanisms to ensure that only one user can access the FTP server at a time. This can prevent conflicts and data corruption that may occur when multiple users try to access the FTP server simultaneously.

$lockFile = fopen("ftp_lock.txt", "w");

if (flock($lockFile, LOCK_EX)) {
    // Perform FTP operations here

    flock($lockFile, LOCK_UN);
} else {
    echo "Could not acquire lock on FTP server. Please try again later.";
}

fclose($lockFile);