The criteria I use is custom for the armory (shops) I have created, so I may not be that helpful as I never had the need to use/extend existing ones. I created mine the same way XF handles them:
First step is to prepare each criteria for the preSave, if they exist.
PHP:
public static function prepareCriteriaForSave($criteria)
{
$criteria = self::unserializeCriteria($criteria);
$criteriaPreSave = array();
foreach ($criteria AS $itemCriteria)
{
if (!empty($itemCriteria['rule']))
{
if (empty($itemCriteria['data']) || !is_array($itemCriteria['data']))
{
$itemCriteria['data'] = array();
}
$criteriaPreSave[] = array(
'rule' => $itemCriteria['rule'],
'data' => $itemCriteria['data']
);
}
}
return $criteriaPreSave;
}
Next, when a user visits the shop page, each items criteria (if any), is prepared to be checked against:
PHP:
public static function prepareCriteriaForSelection($criteria)
{
$criteria = self::unserializeCriteria($criteria);
$output = array();
foreach ($criteria AS $itemCriteria)
{
$data = (!empty($itemCriteria['data']) ? $itemCriteria['data'] : true);
$output[$itemCriteria['rule']] = $data;
}
return $output;
}
after that, the criteria for the item is checked against the users data (usergroup, user id, created character class, race, gender, etc). Below is a snippet of the code I use. All I want is a true or false to be returned as quickly as possible.
PHP:
public static function charMatchesCriteria($criteria, array $charData = null, $visitorsName = '', $secondaryGroups = '')
{
if (!$criteria = self::unserializeCriteria($criteria))
{
return true; // no criteria
}
foreach ($criteria AS $criterion)
{
$data = $criterion['data'];
switch ($criterion['rule'])
{
case 'username':
if (utf8_strtolower($data['name']) != utf8_strtolower($visitorsName))
{
return false;
}
else
{
return true; // made for a member, no other criteria matters
}
break;
case 'usergroup':
$secondaryGroups = ($secondaryGroups ? explode(',', $secondaryGroups) : array());
if (!in_array($data['user_group_id'], $secondaryGroups))
{
return false;
}
break;
case 'strength_score':
case 'dexterity_score':
case 'constitution_score':
case 'intelligence_score':
case 'wisdom_score':
case 'charisma_score':
$abilityKey = substr($criterion['rule'], 0, strlen($criterion['rule']) -6);
if ($charData['iwd_stats'][$abilityKey]['score'] < $data['score'])
{
return false;
}
break;
... and a few more checks...
For each item a user may be able to purchase, the above check is done. If false, the item can not be selected for purchase (or is not visible depending if it is made for a specific usergroup or person), if true, it is displayed for possible purchase.
Just a note: I do not use any template helpers for criteria checks as they are completed before the data is sent to the appropriate template.
I don't know if the above will help, as it is used for page callbacks (to generate a list of displayed-able items for purchase), and then again for the controller public part to ensure a user is not trying to cheat.
