In PHP, what are the implications of server-server connections when encountering syntax errors like "500 Syntax error, command unrecognized" in FTP interactions?

When encountering a "500 Syntax error, command unrecognized" in FTP interactions in PHP, it typically means there is a syntax error in the FTP command being sent to the server. To solve this issue, double-check the FTP command being used and ensure it follows the correct syntax for the FTP server. Additionally, make sure the FTP server supports the command being sent. 

// Example of connecting to an FTP server and uploading a file
$ftp_server = 'ftp.example.com';
$ftp_username = 'username';
$ftp_password = 'password';

// Connect to FTP server
$ftp_conn = ftp_connect($ftp_server);
$login = ftp_login($ftp_conn, $ftp_username, $ftp_password);

if ($ftp_conn && $login) {
    // Upload a file to the FTP server
    $file = 'local_file.txt';
    $remote_file = 'remote_file.txt';
    
    if (ftp_put($ftp_conn, $remote_file, $file, FTP_ASCII)) {
        echo "File uploaded successfully.";
    } else {
        echo "Error uploading file.";
    }
    
    // Close FTP connection
    ftp_close($ftp_conn);
} else {
    echo "Failed to connect to FTP server.";
}

Keywords

PHP server-server connections syntax errors FTP interactions 500 Syntax error

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