How to delete one value from a multiple-valued attribute of LDAP by ldap_mode_del() function.

deleteOneValFromLdapMultiValAttr.php

/**
 * Removes member(s) from alias(es).
 * @param mixed (string|array) member(s)
 * @param mixed (string|array) alias(es)
 * @return bool
 */
public function removeMemberFromAlias($member,$alias=null)
{
	if(is_string($member))
		$member=array($member);
	
	foreach($member as $mem)
	{
		// Not set alias, search all aliases
		if(!isset($alias))
			$alias=$this->filter('(&(objectClass=Alias)(mailForwardingAddress='.$mem.'))',array('uid'));
		else if(is_string($alias))
			$alias=array($alias);		

		foreach($alias as $al)
		{
			$al=$al['uid'];
			$alDN=$this->getUserDN($al);
                        /**
                         * HERE IT IS
                         */
			$delEntry=array('mailForwardingAddress'=>$mem);
			$r=@ldap_mod_del($this->activeConnection,$alDN,$delEntry);
			if(!$r)
			{
				$errorMessage=sprintf('Can not remove alias member %s from %s: %s',$mem,$al,ldap_error($this->activeConnection));
				return $this->syslogger($errorMessage);
			}
		}
	}

	return true;
}