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Logic

The Logic tag can build conditional rules for use by the If, Control, and Loop tags.

Overview​

Here is a full example with explanataion below. It applies a set of rules to match weekend seminars from the event post type.

<Logic name=weekend_seminar>
  <Rule taxonomy=event_type value=seminar />
  <Any>
    <Rule field=weekday value=saturday />
    <Rule field=weekday value=sunday />
  </Any>
</Logic>

<Loop post_type=event count=3>
  <If logic=weekend_seminar>
    Weekend seminar: <Field title /><br>
  <Else />
    Weekday seminar: <Field title /><br>
  </If>
</Loop>

Logic tag​

The Logic tag defines a set of rules using Rule, And, Or, and Not tags.

<Logic name=weekend_seminar>
  ...
</Logic>

It requires a name attribute, which gives a name to the rules defined. This can be referred to later in the page to evaluate the condition, such as for every post inside a loop.

Optionally, use the compare attribute to decide how the rules are combined: and, or, not. The default is and, which means all rules must be true.

Rule tag​

The Rule tag is used to define a rule. It accepts all attributes supported by the If tag.

<Rule taxonomy=event_type value=seminar />

Operators: Any, All, Not​

The Any, All, and Not tags are used to group rules together with a logical operator.

All rules must be true​

<All>
  <Rule ... />
  <Rule ... />
</All>

All rules must be false​

<All false>
  <Rule ... />
  <Rule ... />
</All>

At least one rule must be true​

<Any>
  <Rule ... />
  <Rule ... />
</Any>

Not all rules are true​

<Not>
  <Rule ... />
  <Rule ... />
</Not>

This is the opposite of All.

Use logic with other tags​

The If tag supports the logic attribute, which evaluates the rules defined by the logic of that name.

<If logic=weekend_webinar>
  ...
<Else />
  ...
</If>

It can be used inside a Loop tag to filter items.

<Loop post_type=event>
  <If logic=weekend_webinar>
    ...
  </If>
</Loop>