---
title: "Fluid Syntax: Conditions & Booleans"
manual: "Fluid Explained"
version: "main"
permalink: "https://docs.typo3.org/permalink/fluid:conditions-syntax"
source: "Syntax/ConditionsBooleans.rst"
rendered: "2026-09-26T08:24:58+00:00"
---

# Fluid Syntax: Conditions & Booleans {#conditions-syntax}

## Boolean conditions {#boolean-conditions}

Boolean conditions are expressions that evaluate to true or false.

Boolean conditions can be used as ViewHelper arguments, whenever the datatype
`boolean` is given, e.g. in the `condition` argument of the
[\<f:if> ViewHelper](https://docs.typo3.org/permalink/fluid:typo3fluid-fluid-if).

1.  The expression can be a variable, which is evaluated as follows:

    -   Number: Evaluates to `true` if it is *not* `0`.
    -   Array: Evaluates to `true` if it contains at least one element.
1.  The expression can be a statement consisting of: `term1 operator term2`, for
    example `{variable} > 3`.

    -   The operator can be one of the following: `>`, `>=`, `<`, `<=`,
        `==`, `===`, `!=`, `!==`, or `%`.
1.  The previous expressions can be combined with `||` (logical OR) or `&&` (logical AND).

Examples:

```xml
<f:if condition="{myObject}">
  ...
</f:if>

<f:if condition="{myNumber} > 3 || {otherNumber} || {somethingElse}">
   <f:then>
      ...
   </f:then>
   <f:else>
      ...
   </f:else>
</f:if>

<my:custom showLabel="{myString} === 'something'">
  ...
</my:custom>
```

Example using the inline notation:

```xml
<div class="{f:if(condition: blog.posts, then: 'blogPostsAvailable', else: 'noPosts')}">
  ...
</div>
```

## Boolean literals {#boolean-literals}

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The boolean literals {true} and {false} have been introduced.

You can use the boolean literals `{true}` and `{false}` in ViewHelper calls. This works
both in tag and inline syntax:

```xml
<f:render section="MySection" optional="{true}" />

{f:render(section: 'MySection', optional: true)}
```

If a ViewHelper argument is defined as `boolean`, it is also possible to provide
values of different types, which will then be implicitly converted to a boolean:

```xml
<f:render section="MySection" optional="1" />
```

This can be used to remain compatible to Fluid 2, which did not support boolean literals
in all cases.