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Mini-Chat Tutorial

By: Codewalkers	Search For More Articles! Disclaimer Author Terms
Rating: / 17
2002-07-24

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Mini-Chat Tutorial - Final Script

(Page 4 of 4 )

&lt;?PHP
// Contains db constants
require "cst.inc";

/*
CREATE TABLE MINICHAT (
  NB tinyint(4) NOT NULL auto_increment,
  LOGIN varchar(20) NOT NULL default '',
  MESSAGE varchar(255) NOT NULL default '',
  ITSTIME varchar(10) NOT NULL default '',
  PRIMARY KEY  (NB),
  UNIQUE KEY NB (NB),
  KEY NB_2 (NB)
);
*/

// Connect
mysql_connect( $db_hostname, $db_username, $db_password );
mysql_selectdb( $db_database );

// Add message into minichat
function addMessage( $login, $message ) {

   @setcookie( "minichatlogin", strip_tags( $login ) );

   $login = $_COOKIE['minichatlogin'] ? $_COOKIE['minichatlogin'] :
      mysql_escape_string( strip_tags( $login ) );
   $message = mysql_escape_string( strip_tags( $message, '&lt;a&gt;&lt;b&gt;&lt;i&gt;&lt;u&gt;') );
   mysql_query( "INSERT INTO MINICHAT ( NB, ITSTIME, LOGIN, MESSAGE ) VALUES ( '10', '".time()."', '".$login."','".$message."' )" );
   mysql_query( "UPDATE MINICHAT SET NB=NB-1" );
   mysql_query( "DELETE FROM MINICHAT WHERE NB &lt; 1" );
}

// Returns messages
function getMessages() {
   $rs = mysql_query( "SELECT * FROM MINICHAT ORDER BY NB" );

   $ret = Array();
   while ( $msg = mysql_fetch_array( $rs )) {
      $ret[] = date('h:m', $msg['ITSTIME'] )." ".$msg['LOGIN']." &gt;".$msg['MESSAGE'];
   }

   return $ret;
}

// Prints mini chat
function miniChat() {

   $msgs = getMessages();
   @reset( $msgs );

   echo '&lt;form method="post"&gt;
         &lt;table border="0" bgcolor="#000000" cellpadding="1"&gt;
         &lt;tr&gt;&lt;td&gt;
         &lt;table border="0" bgcolor="#ffffff" cellpadding="1"&gt;
   ';

   while ( list(,$msg) = each( $msgs ))
      echo "&lt;tr&gt;&lt;td&gt;$msg&lt;/td&gt;&lt;/tr&gt;";

   if ( !$_COOKIE['minichatlogin'] ) {
      if ( !$_POST['login'] )
         echo '&lt;tr&gt;&lt;td&gt;Login:&lt;input type="text" name="login" size="6"&gt;&lt;/td&gt;&lt;/tr&gt;';
      else
         echo '&lt;input type="hidden" name="login" value="'.$_POST['login'].'"&gt;';
   }
   echo '
   &lt;tr&gt;&lt;td&gt;&lt;input type="text" name="msg" size="10"&gt;&lt;/td&gt;&lt;/tr&gt;
   &lt;tr&gt;&lt;td align="center"&gt;&lt;input type="submit" value="Send"&gt;&lt;/td&gt;&lt;/tr&gt;
   &lt;/table&gt;&lt;/tr&gt;&lt;/td&gt;&lt;/table&gt;&lt;/form&gt;';
}
?&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Mini Chat Sample&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;?php miniChat(); ?&gt;
&lt;/body&gt;
&lt;/html&gt;

Next time, we'll see how to ensure that no more than one person has the same login, which is possible right now, introduce smileys and a censor system, as well as an anti-spam system.

DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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