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LDAP Controls

Here are some examples of using LDAP Controls with PHP >= 7.3.0.

Example #1 Bind with ppolicy information

<?php

$user   
'cn=admin,dc=example,dc=com';
$passwd 'adminpassword';

$ds ldap_connect('ldap://localhost');

if (
$ds) {
    
$r ldap_bind_ext($ds$user$passwd, [['oid' => LDAP_CONTROL_PASSWORDPOLICYREQUEST]]);

    if (
ldap_parse_result($ds$r$errcode$matcheddn$errmsg$referrals$ctrls)) {
        if (
$errcode != 0) {
            die(
"Error: $errmsg ($errcode)");
        }
        if (isset(
$ctrls[LDAP_CONTROL_PASSWORDPOLICYRESPONSE])) {
            
$value $ctrls[LDAP_CONTROL_PASSWORDPOLICYRESPONSE]['value'];
            echo 
"Expires in: ".$value['expire']." seconds\n";
            echo 
"Number of auth left: ".$value['grace']."\n";
            if (isset(
$value['error'])) {
                echo 
"Ppolicy error code: ".$value['error'];
            }
        }
    }
} else {
    die(
"Unable to connect to LDAP server");
}
?>

Example #2 Modify description only if it's not empty

<?php
// $link is an LDAP connection

$result ldap_mod_replace_ext(
    
$link,
    
'o=test,dc=example,dc=com',
    [
'description' => 'New description'],
    [
        [
            
'oid'         => LDAP_CONTROL_ASSERT,
            
'iscritical'  => TRUE,
            
'value'       => ['filter' => '(!(description=*))']
        ]
    ]
);

// Then use ldap_parse_result
?>

Example #3 Read some values before deletion

<?php
// $link is an LDAP connection

$result ldap_delete_ext(
    
$link,
    
'o=test,dc=example,dc=com',
    [
        [
            
'oid'         => LDAP_CONTROL_PRE_READ,
            
'iscritical'  => TRUE,
            
'value'       => ['attrs' => ['o''description']]
        ]
    ]
);

// Then use ldap_parse_result
?>

Example #4 Delete a reference

<?php
// $link is an LDAP connection

// Without the control it would delete the referenced node
// Make sure to set the control as critical to avoid that
$result ldap_delete_ext(
    
$link,
    
'cn=reference,dc=example,dc=com',
    [[
'oid' => LDAP_CONTROL_MANAGEDSAIT'iscritical' => TRUE]]
);

// Then use ldap_parse_result
?>

Example #5 Use pagination for a search

<?php
// $link is an LDAP connection

$cookie '';

do {
    
$result ldap_search(
        
$link'dc=example,dc=base''(cn=*)', ['cn'], 000LDAP_DEREF_NEVER,
        [[
'oid' => LDAP_CONTROL_PAGEDRESULTS'value' => ['size' => 2'cookie' => $cookie]]]
    );
    
ldap_parse_result($link$result$errcode $matcheddn $errmsg $referrals$controls);
    
// To keep the example short errors are not tested
    
$entries ldap_get_entries($link$result);
    foreach (
$entries as $entry) {
        echo 
"cn: ".$entry['cn'][0]."\n";
    }
    if (isset(
$controls[LDAP_CONTROL_PAGEDRESULTS]['value']['cookie'])) {
        
// You need to pass the cookie from the last call to the next one
        
$cookie $controls[LDAP_CONTROL_PAGEDRESULTS]['value']['cookie'];
    } else {
        
$cookie '';
    }
    
// Empty cookie means last page
} while (!empty($cookie));
?>
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