Tìm hiểu về hàm ftp_get() trong PHP

<?php

// Connect to FTP server

// Use a correct ftp server
$ftp_server = "localhost";

// Use correct ftp username
$ftp_username="user";

// Use correct ftp password corresponding
// to the ftp username
$ftp_userpass="user";

// Establishing ftp connection
$ftp_connection = ftp_connect($ftp_server)
	or die("Could not connect to $ftp_server");

if( $ftp_connection ) {
	echo "successfully connected to the ftp server!";
	
	// Logging in to established connection
	// with ftp username password
	$login = ftp_login($ftp_connection,
			$ftp_username, $ftp_userpass);
	
	if($login) {
		
		// Checking whether logged in successfully
		// or not
		echo "<br>logged in successfully!";
		
		// Name or path of the localfile to
		// where the file to be downloaded
		$local_file = "local_file.txt";
		
		// Name or path of the server file to
		// be downloaded
		$server_file = "server_file.txt";
		
		// Downloading the specified server file
		if (ftp_get($ftp_connection, $local_file,
				$server_file, FTP_BINARY)) {
			echo "<br>Successfully downloaded "
			. "from $server_file to $local_file.";
		}
		else {
			echo "<br>Error while downloading from "
				. "$server_file to $local_file.";
		}
		
	}
	else {
		echo "<br>login failed!";
	}
	
	// echo ftp_get_option($ftp_connection, 1);
	// Closing connection

	if(ftp_close($ftp_connection)) {
		echo "<br>Connection closed Successfully!";
	}
}
?>

<?php

// Connect to FTP server

// Use a correct ftp server
$ftp_server = "localhost";

// Use correct ftp username
$ftp_username="user";

// Use correct ftp password corresponding
// to the ftp username
$ftp_userpass="user";

// Establishing ftp connection
$ftp_connection = ftp_connect($ftp_server, 21)
	or die("Could not connect to $ftp_server");

if( $ftp_connection ) {
	echo "successfully connected to the ftp server!";
	
	// Logging in to established connection
	// with ftp username password
	$login = ftp_login($ftp_connection,
			$ftp_username, $ftp_userpass);
	
	if($login) {
		
		// Checking whether logged in successfully
		// or not
		echo "<br>logged in successfully!";
		
		// Name or path of the localfile to
		// where the file to be downloaded
		$local_file = "local_file_shiva.jpg";
		
		// Name or path of the server file to
		// be downloaded
		$server_file = "shiva.jpg";
		
		// Downloading the specified server file
		if (ftp_get($ftp_connection, $local_file,
				$server_file, FTP_BINARY)) {
			echo "<br>Successfully downloaded from"
				. " $server_file to $local_file.";
		}
		else {
			echo "<br>Error while downloading from"
				. " $server_file to $local_file.";
		}
		
	}
	else {
		echo "<br>login failed!";
	}
	
	// echo ftp_get_option($ftp_connection, 1);
	// Closing connection

	if(ftp_close($ftp_connection)) {
		echo "<br>Connection closed Successfully!";
	}
}
?>