Red And Green Clouds - PHP

Let's now take a look at "out.php", the PHP code used to generate the file list.

<table border="0" cellspacing="0" cellpadding="0">
<?
// get a list of documents the user has "view" permission for
$connection = mysql_connect($hostname, $user, $pass) or die ("Unable to
connect!");
$query = "SELECT data.id, user.username, data.realname, data.created,
data.description, data.comment, data.status FROM data, user, perms WHERE
data.id = perms.fid AND user.id = data.owner AND perms.uid = '$SESSION_UID'
AND perms.rights = '1'";
$result = mysql_db_query($database, $query, $connection) or die ("Error in
query: $query. " . mysql_error());
// how many records returned?
$count = mysql_num_rows($result);
?>
<tr>
<td><? echo $count; ?> document(s) found<p></td>
</tr>
<?
// iterate through resultset
while(list($id, $owner, $realname, $created, $description, $comment,
$status) = mysql_fetch_row($result))
{
// correction for empty description
if ($description == "") { $description = "No description available"; }
// set filename for filesize() call below
$filename = $dataDir . $id . ".dat";
// begin displaying file list with basic information
?>
<tr>
<td><b><? echo "<a href=\"details.php?id=$id\">$realname</a>"; ?></b></td>
</tr>
<tr>
<td><font size="-1"><? echo $description; ?></font></td>
</tr>
<tr>
<td><font size="-1">Document created on <? echo fixDate($created); ?> by
<b><? echo $owner; ?></b> | <? echo filesize($filename); ?>
bytes</font></td>
</tr>
<?
// code to display status message and icon for each file - snipped
?>
<tr>
<td>
 
</td>
</tr>
<?
}
// clean up
mysql_free_result ($result);
mysql_close($connection);
?>
</table>

Pay attention to the query - I'm joining the "user", "data" and "perms" tables together to obtain detailed information (description, creation date, owner) for those files which contain the logged-in user's ID and a permission value of 1 (view). Once I have a dataset, I use a "while" loop to iterate through it and display the file list.

Next, the $filename variable. As I've already mentioned, once a document is entered into the repository, I don't plan to retain the original file name, but rather hope to rename it in the form "fileID.dat". So I've generated a filename on the basis of each file ID, and am using the filesize() function to display the size of the file as part of the description.

The fixDate() function is used to turn the mySQL timestamp into something a little more readable.

// function to format mySQL DATETIME values
function fixDate($val)
{
//split it up into components
$arr = explode(" ", $val);
$timearr = explode(":", $arr[1]);
$datearr = explode("-", $arr[0]);
// create a timestamp with mktime(), format it with date()
return date("d M Y (H:i)", mktime($timearr[0], $timearr[1], $timearr[2],
$datearr[1], $datearr[2], $datearr[0]));
}

Finally, before we leave this script, let's explore the section used to display a message indicating whether or not the file is available for check-out.

<?
// check the status of each file
// 0 -> file is not checked out
// display appropriate message and icon
if ($status == 0)
{
?>
<tr>
<td><img src="images/a.jpg" width=40 height=33 alt="" border=0
align="absmiddle"><font size="-1" color="#43c343"><b>This document is
available to be checked out</b></font></td>
</tr>
<?
}
else
{
// not 0 -> implies file is checked out to another user
// run a query to find out user's name
$query2 = "SELECT username FROM user WHERE id = '$status'";
$result2 = mysql_db_query($database, $query2, $connection) or die ("Error
in query: $query2 . " . mysql_error());
list($username) = mysql_fetch_row($result2);
// and display message and icon
?>
<tr>
<td>
<img src="images/na.jpg" width=40 height=33 alt="" border=0
align="absmiddle"><font size="-1" color="#e9202a">This document is
currently checked out to <b><? echo $username; ?></b></font>
</td>
</tr>
<?
}
?>

Depending on the value of the "status" column, an icon and message is displayed for each file; green indicates that the file is available, while red indicates that it is not.

And here's what it all looks like.



This article copyright Melonfire 2001. All rights reserved.

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

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