Constant ViewHelper <f:constant>

Displaying global PHP constants in Fluid

You can display global PHP constants using this ViewHelper

Maximal possible number: {f:constant(name: 'PHP_INT_MAX')}

<f:if condition="{f:constant(name: 'PHP_MAJOR_VERSION')} >= 8">
    Using PHP 8.0 or greater
</f:if>

Get class constant

You can display any public class constant from a class within TYPO3, for example constants from \TYPO3\CMS\Core\Information\Typo3Information :

Join the <f:link.external uri="{f:constant(name: '\TYPO3\CMS\Core\Information\Typo3Information::URL_COMMUNITY')}">
    TYPO3 Community
</f:link.external>!

Using enum cases in Fluid

Cases of enums are objects and not strings or integers. They cannot be directly output in the template. You can however save them into a variable and then use their value. For example you can use values of the enum cases in \TYPO3\CMS\Core\Resource\FileType to compare them with a value of your object:

<f:variable name="imageType"><f:constant name="\TYPO3\CMS\Core\Resource\FileType::IMAGE"/></f:variable>
The image case has the value {imageType.value} and name {imageType.name}:
<f:if condition="{myFile.type} === {imageType.value}">
    This file is an image!
</f:if>

Arguments