silverstripe-framework/forms/ReadonlyField.php

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<?php
/**
* Read-only field to display a non-editable value with a label.
* Consider using an {@link LabelField} if you just need a label-less
* value display.
*
* @package forms
* @subpackage fields-basic
*/
class ReadonlyField extends FormField {
protected $readonly = true;
function performReadonlyTransformation() {
return clone $this;
}
}