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PHP

Stream Me Up, Scotty! (part 1)
By: Vikram Vaswani, (c) Melonfire
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    2000-11-07


    Table of Contents:
  • Stream Me Up, Scotty! (part 1)
  • Out With The Old...
  • ...In With The New
  • Where Am I?
  • GETting It Right
  • Start Me Up!
  • Lights! Camera! Action!
  • Well-Formed Ideas
  • Appendix: Code Listing

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    Stream Me Up, Scotty! (part 1) - Out With The Old...
    ( Page 2 of 9 )

    The first thing you should know is that PHP allows file transfer across both HTTP and FTP connections. The ability to upload files over HTTP has been available since PHP3, while the newer FTP functions have made an appearance only in later versions of PHP3 and in PHP4.

    Before we begin, you need to make sure that your version of PHP includes FTP support. You can check this by creating a PHP file containing the code

    <? phpinfo(); ?>
    and checking the resulting output through your Web browser. There's a section named "Additional Modules" which lists the modules supported by your build; in case you don't find the FTP module listed, you'll need to recompile your build with FTP support.

    To start with, let's refresh your memory of what a typical FTP session looks like:

    $ ftp ftp.server.com Connected to ftp.server.com 220 server.com FTP server ready. Name (server:john): john 331 Password required for john. Password: 230 User john logged in. Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 200 PORT command successful. 150 Opening ASCII mode data connection for /bin/ls. drwxr-xr-x 5 john users 3072 Nov 2 11:03 . drwxr-xr-x 88 root root 2048 Nov 1 23:26 .. drwxr--r-- 2 john users 1024 Oct 5 13:26 bin drwx--x--x 8 john users 1024 Nov 2 10:59 public_html drwxr--r-- 4 john users 1024 Nov 2 11:26 tmp -rw-r--r-- 1 john users 2941465 Oct 9 17:21 data.zip 226 Transfer complete. ftp> bin 200 Type set to I. ftp> get data.zip local: data.zip remote: data.zip 200 PORT command successful. 150 Opening BINARY mode data connection for data.zip(2941465 bytes). 226 Transfer complete. ftp> bye 221 Goodbye.
    As you can see, the process can be broken down into clearly-identifiable segments. There's the connection phase (which opens a connection to the FTP server); the authentication phase (where the user identifies himself or herself and is permitted access to the FTP site); the transaction phase (which involves operations like directory navigation, file listing, and file GET or PUT); and the disconnection phase (which terminates the FTP connection cleanly). Nice and symmetrical, right?

    This article copyright Melonfire 2000. All rights reserved.

     
     
    >>> More PHP Articles          >>> More By Vikram Vaswani, (c) Melonfire
     

       

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