IsFalse

Validates that a value is false. Specifically, this checks to see if the value is exactly false, exactly the integer 0, or exactly the string '0'.

Also see IsTrue.

Applies to	property or method
Class	IsFalse
Validator	IsFalseValidator

Basic Usage

The IsFalse constraint can be applied to a property or a "getter" method, but is most commonly useful in the latter case. For example, suppose that you want to guarantee that some state property is not in a dynamic invalidStates array. First, you'd create a "getter" method:

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        protected string $state;

protected array $invalidStates = [];

public function isStateInvalid(): bool
{
    return in_array($this->state, $this->invalidStates);
}
    

In this case, the underlying object is only valid if the isStateInvalid() method returns false:

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        // src/Entity/Author.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    #[Assert\IsFalse(
        message: "You've entered an invalid state."
    )]
    public function isStateInvalid(): bool
    {
        // ...
    }
}
    

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        # config/validator/validation.yaml
App\Entity\Author:
    getters:
        stateInvalid:
            - 'IsFalse':
                message: You've entered an invalid state.
    

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        <!-- config/validator/validation.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping https://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">

    <class name="App\Entity\Author">
        <getter property="stateInvalid">
            <constraint name="IsFalse">
                <option name="message">You've entered an invalid state.</option>
            </constraint>
        </getter>
    </class>
</constraint-mapping>
    

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        // src/Entity/Author.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Mapping\ClassMetadata;

class Author
{
    // ...

    public static function loadValidatorMetadata(ClassMetadata $metadata): void
    {
        $metadata->addGetterConstraint('stateInvalid', new Assert\IsFalse(
            message: "You've entered an invalid state.",
        ));
    }

    public function isStateInvalid(): bool
    {
        // ...
    }
}
    

Note

As with most of the other constraints, null is considered a valid value. This is to allow the use of optional values. If the value is mandatory, a common solution is to combine this constraint with NotNull.

Options

`groups`

type: array | string default: null

It defines the validation group or groups of this constraint. Read more about validation groups.

`message`

type: string default: This value should be false.

This message is shown if the underlying data is not false.

You can use the following parameters in this message:

Parameter	Description
`{{ value }}`	The current (invalid) value
`{{ label }}`	Corresponding form field label

`payload`

type: mixed default: null

This option can be used to attach arbitrary domain-specific data to a constraint. The configured payload is not used by the Validator component, but its processing is completely up to you.

For example, you may want to use several error levels to present failed constraints differently in the front-end depending on the severity of the error.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

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