(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)
ldap_search -- Search LDAP tree
Description
int ldap_search (int link_identifier, string base_dn, string filter [,
array attributes [, int attrsonly [, int sizelimit [, int timelimit [, int deref]]]]])
Returns a search result identifier or FALSE on error.
ldap_search() performs the search for a specified filter on the directory with the scope
of LDAP_SCOPE_SUBTREE. This is equivalent to searching the entire directory.
base_dn specifies the base DN for the directory.
There is a optional fourth parameter, that can be added to restrict the attributes and
values returned by the server to just those required. This is much more efficient than the default
action (which is to return all attributes and their associated values). The use of the fourth
parameter should therefore be considered good practice.
The fourth parameter is a standard PHP string array of the required attributes, eg
array("mail","sn","cn") Note that the "dn" is always returned irrespective of which attributes
types are requested.
Note too that some directory server hosts will be configured to return no more than a
preset number of entries. If this occurs, the server will indicate that it has only returned a
partial results set. This occurs also if the sixth parameter sizelimit has been
used to limit the count of fetched entries.
The fifth parameter attrsonly should be set to 1 if only attribute types
are wanted. If set to 0 both attributes types and attribute values are fetched which is the default
behaviour.
With the sixth parameter sizelimit it is possible to limit the count of
entries fetched. Setting this to 0 means no limit. NOTE: This parameter can NOT override
server-side preset sizelimit. You can set it lower though.
The seventh parameter timelimit sets the number of seconds how long is
spend on the search. Setting this to 0 means no limit. NOTE: This parameter can NOT override
server-side preset timelimit. You can set it lower though.
The eigth parameter deref specifies how aliases should be handled during
the search. It can be one of the following:
-
LDAP_DEREF_NEVER - (default) aliases are never dereferenced.
-
LDAP_DEREF_SEARCHING - aliases should be dereferenced during the search but not when
locating the base object of the search.
-
LDAP_DEREF_FINDING - aliases should be dereferenced when locating the base object but not
during the search.
-
LDAP_DEREF_ALWAYS - aliases should be dereferenced always.
Note: These optional parameters were added in 4.0.2: attrsonly,
sizelimit, timelimit, deref.
The search filter can be simple or advanced, using boolean operators in the format
described in the LDAP doumentation (see the Netscape
Directory SDK for full information on filters).
The example below retrieves the organizational unit, surname, given name and email address
for all people in "My Company" where the surname or given name contains the substring $person. This
example uses a boolean filter to tell the server to look for information in more than one
attribute.
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Example 1. LDAP search
// $ds is a valid link identifier for a directory server
// $person is all or part of a person's name, eg "Jo"
$dn = "o=My Company, c=US";
$filter="(|(sn=$person*)(givenname=$person*))";
$justthese = array( "ou", "sn", "givenname", "mail");
$sr=ldap_search($ds, $dn, $filter, $justthese);
$info = ldap_get_entries($ds, $sr);
print $info["count"]." entries returned<p>";
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From 4.0.5 on it's also possible to do parallel searches. To do this you use an array of
link identifiers, rather than a single identifier, as the first argument. If you don't want the
same base DN and the same filter for all the searches, you can also use an array of base DNs and/or
an array of filters. Those arrays must be of the same size as the link identifier array since the
first entries of the arrays are used for one search, the second entries are used for another, and
so on. When doing parallel searches an array of search result identifiers is returned, except in
case of error, then the entry corresponding to the search will be FALSE. This is
very much like the value normally returned, except that a result identifier is always returned when
a search was made. There are some rare cases where the normal search returns FALSE
while the parallel search returns an identifier.
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