ftp_get

(PHP 4, PHP 5, PHP 7)

ftp_get — 从 FTP 服务器上下载一个文件

说明

bool ftp_get ( resource $ftp_stream , string $local_file , string $remote_file , int $mode [, int $resumepos = 0 ] )

ftp_get() 函数用来下载 FTP 服务器上指定的文件并保存为本地文件。

参数

ftp_stream

FTP 连接的链接标识符。

local_file

文件本地的路径（如果文件已经存在，则会被覆盖）。

remote_file

文件的远程路径。

mode

传送模式。只能为 (文本模式) FTP_ASCII 或 (二进制模式) FTP_BINARY 中的其中一个。

resumepos

从远程文件的这个位置继续下载。

返回值

成功时返回 TRUE， 或者在失败时返回 FALSE。

范例

Example #1 ftp_get() 例子

<?php

// define some variables
$local_file = 'local.zip';
$server_file = 'server.zip';

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

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

// try to download $server_file and save to $local_file
if (ftp_get($conn_id, $local_file, $server_file, FTP_BINARY)) {
    echo "Successfully written to $local_file\n";
} else {
    echo "There was a problem\n";
}

// close the connection
ftp_close($conn_id);

?>

更新日志

版本 说明
4.3.0 增加了 resumepos。

参见

  • ftp_pasv() - 返回当前 FTP 被动模式是否打开
  • ftp_fget() - 从 FTP 服务器上下载一个文件并保存到本地一个已经打开的文件中
  • ftp_nb_get() - 从 FTP 服务器上获取文件并写入本地文件（non-blocking）
  • ftp_nb_fget() - 从 FTP 服务器获取文件并写入到一个打开的文件（非阻塞）

User Contributed Notes

scott dot chu at udngroup dot com 30-Aug-2016 04:23
I'd suggest use ftp_fget() instead of ftp_get() since the latter only return TRUE or FALSE and there's no obvious way to get the cause of failure.

   Using ftp_fget,  you have to pass a file handle as local file, so you have to do fopen() first. By way of this, you can find 'Permission Denied' problem when call fopen(). If you use ftp_get(), there's no way to find this error cause.

   In my case, I run httpd using 'nobody' and I create ftp local folder using 'haha'. It tooks me long time to find the 'Permission Denied' problem at that time since  I use ftp_get() then.
bob at notallhere dot com 04-Apr-2013 02:50
Don't want to use an intermediate file?  Use 'php://output' as the filename and then capture the output using output buffering.

ob_start();
$result = ftp_get($ftp, "php://output", $file, FTP_BINARY);
$data = ob_get_contents();
ob_end_clean();

Don't forget to check $result to make sure there wasn't an error.  After that, manipulate the $data variable however you want.
miki at epoch dot co dot il 23-Dec-2012 06:32
If you ran the example and see that it fail after 90sec (timeout).

Then try adding:
<?php
ftp_pasv($ftp_conn, true);
?>
Ben Parish 26-Jan-2012 10:14
On Windows (and possibly *NIX) you will get "[function.ftp-get]: failed to open stream: No such file or directory in..." errors if the local_file path contains directory paths that do not already exist.

Even with write permissions ftp_get can create the file but it will NOT automatically create the parent directories as you might expect.
danny at ingeniarte dot com 26-Nov-2010 12:37
Remember to use the full server paths to the directories you are working on. Server paths are not the same as "ftp paths".

I was using the path displayed on my FTP client to download and upload files and I kept getting "Not found" or "Permission Denied" errors.
CuDi 23-Oct-2009 04:50
I tried to ftp a 7mb file today off my webserver.

I copied this example directly and it told me.

Port command successful
"there was a problem"

I thought it was because of the size.
But I guessed it might be cause of my firewall.

So I made the ftp connection passive:

<?PHP
 
  ...
  $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
  ftp_pasv($conn_id, true);

?>

Ran the script again & it worked fine.

Hope this helps someone
mroerick at gmx dot net 15-May-2009 09:42
ftp_sync is a way to walk the directory structure on the server and copy every directory and file to the same location locally.

<?php
$ftp_server = "ftp.example.com";
$conn_id = ftp_connect ($ftp_server)
    or die("Couldn't connect to $ftp_server");
   
$login_result = ftp_login($conn_id, "user", "pass");
if ((!$conn_id) || (!$login_result))
    die("FTP Connection Failed");

ftp_sync ("DirectoryToCopy");    // Use "." if you are in the current directory

ftp_close($conn_id); 

// ftp_sync - Copy directory and file structure
function ftp_sync ($dir) {

    global $conn_id;

    if ($dir != ".") {
        if (ftp_chdir($conn_id, $dir) == false) {
            echo ("Change Dir Failed: $dir<BR>\r\n");
            return;
        }
        if (!(is_dir($dir)))
            mkdir($dir);
        chdir ($dir);
    }

    $contents = ftp_nlist($conn_id, ".");
    foreach ($contents as $file) {
   
        if ($file == '.' || $file == '..')
            continue;
       
        if (@ftp_chdir($conn_id, $file)) {
            ftp_chdir ($conn_id, "..");
            ftp_sync ($file);
        }
        else
            ftp_get($conn_id, $file, $file, FTP_BINARY);
    }
       
    ftp_chdir ($conn_id, "..");
    chdir ("..");

}
?>
w dot danford at electronics-software dot com 10-Nov-2008 11:06
A subtle issue with the ftp_get() function. The second param, string $local_file, is a file name on the SERVER running the php script. It is NOT a file on the client machine running the browser. I erroneously tried to use this ftp to download a file from my site to my local system. I entered the full path starting with the drive letter ("h:/...") on a system running WIN XP and kept getting a failure of unable to open (destination) file. Only after just putting in a file name with no pathing did I see where the file was written. It was in the directory on my site where the php script is located (hosting is managed shared LAMP server which supports multiple url's, GoDaddy hosting).
Nate from ruggfamily.com 22-Oct-2008 11:12
Here's a quick function that figures out the correct mode to use based on a file's extension.

<?php
function get_ftp_mode($file)
{   
    $path_parts = pathinfo($file);
   
    if (!isset($path_parts['extension'])) return FTP_BINARY;
    switch (strtolower($path_parts['extension'])) {
        case 'am':case 'asp':case 'bat':case 'c':case 'cfm':case 'cgi':case 'conf':
        case 'cpp':case 'css':case 'dhtml':case 'diz':case 'h':case 'hpp':case 'htm':
        case 'html':case 'in':case 'inc':case 'js':case 'm4':case 'mak':case 'nfs':
        case 'nsi':case 'pas':case 'patch':case 'php':case 'php3':case 'php4':case 'php5':
        case 'phtml':case 'pl':case 'po':case 'py':case 'qmail':case 'sh':case 'shtml':
        case 'sql':case 'tcl':case 'tpl':case 'txt':case 'vbs':case 'xml':case 'xrc':
            return FTP_ASCII;
    }
    return FTP_BINARY;
}

// sample usage
ftp_get($conn_id, $local_file, $server_file, get_ftp_mode($server_file));
?>
Aditya P dot Bhatt (adityabhai at gmail dot com) 25-Mar-2008 12:40
<?php
                // define some variables
        $folder_path = "YOUR FOLDER PATH";
        $local_file = "LOCAL FILE PATH";
        $server_file = "SERVER FILE PATH";
       
        //-- Connection Settings
        $ftp_server = "IP ADDRESS"; // Address of FTP server.
        $ftp_user_name = "USERNAME"; // Username
        $ftp_user_pass = "PASSWORD"; // Password
        #$destination_file = "FILEPATH";
       
        // set up basic connection
        $conn_id = ftp_connect($ftp_server);
       
        // login with username and password
        $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
       
        // try to download $server_file and save to $local_file
        if (ftp_get($conn_id, $local_file, $server_file, FTP_BINARY)) {
            echo "Successfully written to $local_file\n";
        } else {
            echo "There was a problem\n";
        }
       
        // close the connection
        ftp_close($conn_id);
?>
anomie at users dot sf dot net 30-Jan-2007 04:24
Crud. The _nb_ only refers to reading from the ftp server, and the buffer in the socket pair is only about 364 bytes. So it doesn't work for files larger than that size.
anomie at users dot sf dot net 25-Jan-2007 06:50
Why there isn't an "ftp_get_contents" function, I don't know. It takes a little work to emulate one, but it's doable.
<?php
function ftp_get_contents($ftp_stream, $remote_file, $mode, $resume_pos=null){
    $pipes=stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
    if($pipes===false) return false;
    if(!stream_set_blocking($pipes[1], 0)){
        fclose($pipes[0]); fclose($pipes[1]);
        return false;
    }
    $fail=false;
    $data='';
    if(is_null($resume_pos)){
        $ret=ftp_nb_fget($ftp_stream, $pipes[0], $remote_file, $mode);
    } else {
        $ret=ftp_nb_fget($ftp_stream, $pipes[0], $remote_file, $mode, $resume_pos);
    }
    while($ret==FTP_MOREDATA){
        while(!$fail && !feof($pipes[1])){
            $r=fread($pipes[1], 8192);
            if($r==='') break;
            if($r===false){ $fail=true; break; }
            $data.=$r;
        }
        $ret=ftp_nb_continue($ftp_stream);
    }
    while(!$fail && !feof($pipes[1])){
        $r=fread($pipes[1], 8192);
        if($r==='') break;
        if($r===false){ $fail=true; break; }
        $data.=$r;
    }
    fclose($pipes[0]); fclose($pipes[1]);
    if($fail || $ret!=FTP_FINISHED) return false;
    return $data;
}
?>

Something similar would work to write a ftp_put_contents function, too.
administrator at gesoft dot org 13-Aug-2006 12:05
Hello everybody,

If someone will try to download files to the same local file (some temporary file), like shown here:

<?php
foreach ($files as $key=>$path) {
...
  $result = ftp_get($ftpConnId, 'temp.tmp', $path, FTP_BINARY);
...
}
?>

please take in consideration the fact that you will have big problems with downloading (getting) hole files. In other words 'temp.tmp' file always will have the same size equal to first downloaded file despite the real size of downloading file. I have not idea what is the reason!

If someone will think that problem is just in getting proper file size (which you will get using filssize() function) he will be mistaken. The download file's size is not equal to source file's size materially, that means fflush() function will not solve the problem (I have tried this as well).

Finally the solution was founded: before downloading a file you will need to delete local file if such exist ('temp.tmp'). So working code will look like:

<?php
foreach ($files as $key=>$path) {
...
  if (file_exists('temp.tmp')) {
    unlink('temp.tmp');
  }
  $result = ftp_get($ftpConnId, 'temp.tmp', $path, FTP_BINARY);
...
}
?>

Good luck in scripting :-)

Vitali Simsive
corey-holzer at nyc dot rr dot com 23-Jan-2004 03:20
The zero size file is not a side effect.  When the ftp_get starts the first thing it does is to create the inode/file which it will stream the data too and that is a zero size file with the nname you specified for the local file.  When the download fails it leaves the file in place.
thivierr at telus dot net 22-Nov-2003 11:25
If you previously downloaded a file before (like a huge web log), and just want to get the remaining portion, do this:

$local_file_size = filesize($local_file_path);
$get_result = ftp_get($conn_id, $local_file_path, $remote_file_path, FTP_BINARY, $local_file_size);

This same code works regardless of wether the local file exists already or not.  You should first test to make sure the local file is not bigger than the remote file.
ramiro at qusarcr dot com 06-Nov-2002 04:36
Keep in mind that ftp_get will overwrite the file on your local machine if it has the same name.