Description:
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It's a common scenario that you need to increase a counter atomically. E.g. the UidNumber-Counter for a sambaUnixIdPool.

With perl you need just a few lines:

my $umsg = $ld->modify($dn,
delete => { 'uidNumber' => $currentvalue },
add => { 'uidNumber' => $nextvalue});

But this seems not to be possible with PHP because you need two functions calls (ldap_delete, ldap_add) or support for defining operations in ldap_modify.