Several extensions to the existing PHP LDAP API have been developed to make it more suitable to our needs.
PHP Assertion Control
To be able to safely change values, the Assertion Control is needed which results in a Compare-and-Set functionality.
Example (taken from ext/ldap/tests/ldap_control_assertion_basic.phpt):
$link = ldap_connect_and_bind($host, $port, $user, $passwd, $protocol_version); $entry = array( "objectClass" => array( "top", "dcObject", "organization"), "dc" => "stoney-cloud", "o" => "stoney-cloud", "description" => "stoney cloud root object", ); ldap_modify($link, "dc=stoney-cloud,dc=org", $entry); $assertion_string = "(description=stoney cloud root object)"; $control = ldap_control_assertion($link, $assertion_string); // the following fails if the description has been changed already ldap_modify($link, "dc=my-domain,dc=com", $entry, $control);