Using PHP With LDAP (part 2) - Making Lists (
Page 3 of 8 )
So that takes care of searching. Now, how
about adding, editing and deleting entries?
PHP comes with a full-fledged
API that allows easy modification of the LDAP directory tree. In order to
demonstrate how this API works, I'm going to build, over the next few pages, a
simple administration module that performs these functions, so that you can see
how it's done.
First up, we need an index page that lists all the entries
in the directory. This index page will serve as the starting point for an
administrator to make changes to existing directory entries or add new ones.
Here's the code,
<html>
<head>
</head>
<body>
<table width="450" cellpadding="5" cellspacing="5" border="1">
<?php
// specify the LDAP server to connect to
$conn = ldap_connect("localhost") or die("Could not connect to server");
// bind to the LDAP server specified above
$r = ldap_bind($conn) or die("Could not bind to server");
// set base DN and required attribute list
$base_dn = "dc=my-domain, dc=com";
$params = array("mail", "cn", "sn");
// list all entries from the base DN
$result = ldap_list($conn, $base_dn, "cn=*", $params);
?>
<tr>
<td>First Name</td>
<td>Last Name</td>
<td colspan=2> </td>
</tr>
<?php
// get entries
$info = ldap_get_entries($conn, $result);
// and print attribute values
for ($i=0; $i<$info["count"]; $i++)
{
echo "<tr>";
echo "<td>".$info[$i]["cn"][0]."</td>";
echo "<td>".$info[$i]["sn"][0]."</td>";
echo "<td><a href=\"edit.php?mail=" . urlencode($info[$i]["mail"][0]) .
"\">Edit</a></td>";
echo "<td><a href=\"delete.php?mail=" . urlencode($info[$i]["mail"][0])
. "\">Delete</a></td>";
echo "</tr>";
}
// all done? clean up
ldap_close($conn);
?>
</table>
<p>
<a href="add.html">Add new entry</a>
</body>
</html>
and here's what it looks like:
As you can see, most of this code is similar to what
you saw in the previous article. However, there is one important difference -
instead of using the ldap_search() function, I'm using the ldap_list() function,
which returns a one-level list of all the entries matching the specified
criteria, given a base DN at which to start searching.
<?php
// set base DN and required attribute list
$base_dn = "dc=my-domain, dc=com";
$params = array("mail", "cn", "sn");
// list all entries from the base DN
$result = ldap_list($conn, $base_dn, "cn=*", $params);
?>
This base DN and search filter are provided to ldap_list() as
second and third arguments respectively. In the example above, the ldap_list()
function returns all the entries which have a "cn" attribute and are located
immediately under the node with DN "dc=my-domain,dc=com".
Additionally,
ldap_list() accepts a fourth, optional parameter - an array containing a list of
all the attributes that should be included in the result set. In the example
above, this array is called $params, and it specifies that the returned result
set should contain the "cn", "sn" and "mail" attributes.
The search
result identifier returned by the ldap_list() can be passed to the
ldap_get_entries() function, which does the dirty work of extracting the raw
data into a structured array. This array can be processed using a simple "for"
loop.
<?php
// get entries
$info = ldap_get_entries($conn, $result);
// and print attribute values
for ($i=0; $i<$info["count"]; $i++)
{
echo "<tr>";
echo "<td>".$info[$i]["cn"][0]."</td>";
echo "<td>".$info[$i]["sn"][0]."</td>";
echo "<td><a href=\"edit.php?mail=" . urlencode($info[$i]["mail"][0]) .
"\">Edit</a></td>";
echo "<td><a href=\"delete.php?mail=" . urlencode($info[$i]["mail"][0])
. "\">Delete</a></td>";
echo "</tr>";
}
?>
Note also the links to "edit.php" and "delete.php" next to
each entry - I'll be discussing the scripts these links point to shortly. For
the moment, though, skip downwards to the last link on the page, which points to
"add.html" - this is the HTML form that is used to add new users to the
database, and it's discussed on the next page.
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