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@ 2020-10-22T03:47:50Z

<?php

$entries = array (
    0 => 
    array (
        'CN=Abraham Lincoln,CN=Users,DC=test,DC=io' => 
        array (
            'objectclass' => 
            array (
                0 => 'top',
                1 => 'person',
                2 => 'organizationalPerson',
                3 => 'user'
            ),
            'cn' => 'AbrahamLincoln'
        ),
        
    ),
    1 => 
    array (
        'CN=Administrator,CN=Users,DC=test,DC=io' => 
        array (
            'objectclass' => 
            array (
                0 => 'top',
                1 => 'person',
                2 => 'organizationalPerson',
                3 => 'user'
            ),
            'distinguishedname' => 'CN=Administrator,CN=Users,DC=test,DC=io'
        ),
        
    ),
    2 => 
    array (
        'CN=CloudNCUsers,CN=Users,DC=test,DC=io' => 
        array (
            'objectclass' => 
            array (
                0 => 'top',
                1 => 'group'
            ),
            'distinguishedname' => 'CN=CloudNCUsers,CN=Users,DC=test,DC=io'
        ),
        
    ),
    3 => 
    array (
        'CN=Jill Dope,CN=Users,DC=test,DC=io' => 
        array (
            'objectclass' => 
            array (
                0 => 'top',
                1 => 'person',
                2 => 'organizationalPerson',
                3 => 'user'
            ),
            'distinguishedname' => 'CN=JillDope,CN=Users,DC=test,DC=io'
        ),
        
    )
);

$result = array();
foreach ($entries as $entry) {
    $result[key($entry)] = reset($entry);
}
print_r($result);

Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: Array ( [CN=Abraham Lincoln,CN=Users,DC=test,DC=io] => Array ( [objectclass] => Array ( [0] => top [1] => person [2] => organizationalPerson [3] => user ) [cn] => AbrahamLincoln ) [CN=Administrator,CN=Users,DC=test,DC=io] => Array ( [objectclass] => Array ( [0] => top [1] => person [2] => organizationalPerson [3] => user ) [distinguishedname] => CN=Administrator,CN=Users,DC=test,DC=io ) [CN=CloudNCUsers,CN=Users,DC=test,DC=io] => Array ( [objectclass] => Array ( [0] => top [1] => group ) [distinguishedname] => CN=CloudNCUsers,CN=Users,DC=test,DC=io ) [CN=Jill Dope,CN=Users,DC=test,DC=io] => Array ( [objectclass] => Array ( [0] => top [1] => person [2] => organizationalPerson [3] => user ) [distinguishedname] => CN=JillDope,CN=Users,DC=test,DC=io ) )

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150.08 ms | 411 KiB | 5 Q