📄 ftp_mirror.php

📁 《PHP和MySQL Web开发》(第三版) Source

💻 PHP

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<html>
<head>
  <title>Mirror update</title>
</head>
<body>
<h1>Mirror update</h1> 
<?php
// set up variables - change these to suit application 
$host = 'ftp.cs.rmit.edu.au';
$user = 'anonymous';
$password = 'laura@tangledweb.com.au';
$remotefile = '/pub/tsg/teraterm/ttssh14.zip';
$localfile = '/tmp/writable/ttssh14.zip';

// connect to host
$conn = ftp_connect("$host"); 
if (!$conn)
{
  echo 'Error: Could not connect to ftp server<br>';
  exit;
}
echo "Connected to $host.<br>";

// log in to host
@ $result = ftp_login($conn, $user, $pass);
if (!$result)
{
  echo "Error: Could not log on as $user<br>";
  ftp_quit($conn);
  exit;
}
echo "Logged in as $user<br>";

// check file times to see if an update is required
echo 'Checking file time...<br>';
if (file_exists($localfile)) 
{
  $localtime = filemtime($localfile);
  echo 'Local file last updated ';
  echo date('G:i j-M-Y', $localtime);
  echo '<br>';
}
else
  $localtime=0; 
$remotetime = ftp_mdtm($conn, $remotefile);
if (!($remotetime >= 0))
{
   // This doesn't mean the file's not there, server may not support mod time 
   echo 'Can\'t access remote file time.<br>';  
   $remotetime=$localtime+1;  // make sure of an update  
}
else
{
  echo 'Remote file last updated ';
  echo date('G:i j-M-Y', $remotetime);
  echo '<br>';
}
if (!($remotetime > $localtime))
{
   echo 'Local copy is up to date.<br>';
   exit;
}

// download file
echo 'Getting file from server...<br>';
$fp = fopen ($localfile, 'w');
if (!$success = ftp_fget($conn, $fp, $remotefile, FTP_BINARY))
{
  echo 'Error: Could not download file'; 
  ftp_quit($conn);
  exit;
}
fclose($fp);
echo 'File downloaded successfully';

// close connection to host
ftp_quit($conn);

?>
</body>
</html>

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