PHP Database that shows web page access

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<source_code>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>show IP numbers</TITLE>
</HEAD>
<body
background=""
bgcolor="#000000"
text="#33FF33"
link="#33FF33"
alink="#33FF33"
vlink="#33FF33">
<?php
$this_url="http://www.yourdomainname.org";
$database="put-your-database-name-here";
$user="put-your-database-user-name-here";
$password="put-your-database-user-password-here";
$host="localhost"; 
$dbh=mysql_connect (${host},${user},${password}) or die ('I cannot connect to the database because: ' . 
mysql_error());
mysql_select_db ($database);
echo "<h3>Database of Visitors</h3>";
echo "MySQL is currently: ";
echo date("l dS of F Y h:i:s A");
echo "<br>";
$sql = 'SELECT * ';
$sql .= " FROM `ip_visit` ORDER by `time` DESC LIMIT 40 ";
$results = mysql_query( ${sql});
$error=mysql_error();
echo "{$error}";

while($row = mysql_fetch_row($results)) {
echo "<hr>";
if ($REMOTE_ADDR==$row[0]) {echo "this ip is yours:<br>";}
whonumber($row[0]);
echo " time of access:  ".$row[1]."<br>webpage: ";
linker($row[2],$row[2]);
echo "<hr><br>";
} 

function insert_showaccess($this_url, $REMOTE_ADDR , $PHP_SELF) {
$sql = "INSERT INTO `ip_visit` ( `ip_number` , `time` , `webpage` ) ";
$sql.= " VALUES ( '".$REMOTE_ADDR."', now() , '".$this_url.$PHP_SELF."' );";
mysql_query($sql);
}

function whonumber($ip_num) {
echo "<form name=\"thisform\" method=\"POST\" action=\"http://ws.arin.net/cgi-bin/whois.pl\">
<input type=\"text\" Name=\"queryinput\"";
echo " value=\"".$ip_num."\"";
echo " size=\"20\"><input type=\"submit\" value=go></form>";
}

function makevisitortable($database) {
mysql_select_db ($database);
 $sql = 'CREATE TABLE `ip_visit` ( `ip_number` varchar( 16 ) NOT NULL default \'\','
        . ' `time` datetime NOT NULL default \'0000-00-00 00:00:00\','
        . ' `webpage` varchar( 128 ) NOT NULL default \'\','
        . ' `nmap` tinytext NOT NULL ) TYPE = MYISAM ';
mysql_query($sql);
}

function linker($url,$link) {
echo "<a href=\"$url\">$link</a>";
}

if ($HTTP_GET_VARS['create_db_table']==yes) {
makevisitortable($database);
}

insert_showaccess($this_url, $REMOTE_ADDR , $PHP_SELF);
?>

</body>
</html>
<?php
die();
?>

</source_code>

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