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WARNING: You are browsing the documentation for Symfony 2.4 which is not maintained anymore. Consider upgrading your projects to Symfony 5.1.

Length

2.4 version
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Length

Validates that a given string length is between some minimum and maximum value.

Applies to property or method
Options
Class Symfony\Component\Validator\Constraints\Length
Validator Symfony\Component\Validator\Constraints\LengthValidator

Basic Usage

To verify that the firstName field length of a class is between “2” and “50”, you might add the following:

  • YAML
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    # src/Acme/EventBundle/Resources/config/validation.yml
Acme\EventBundle\Entity\Participant:
    properties:
        firstName:
            - Length:
                min: 2
                max: 50
                minMessage: "Your first name must be at least {{ limit }} characters long"
                maxMessage: "Your first name cannot be longer than {{ limit }} characters long"
  • Annotations
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    // src/Acme/EventBundle/Entity/Participant.php
namespace Acme\EventBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Participant
{
    /**
     * @Assert\Length(
     *      min = 2,
     *      max = 50,
     *      minMessage = "Your first name must be at least {{ limit }} characters long",
     *      maxMessage = "Your first name cannot be longer than {{ limit }} characters long"
     * )
     */
     protected $firstName;
}
  • XML
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    <!-- src/Acme/EventBundle/Resources/config/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 http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">

    <class name="Acme\EventBundle\Entity\Participant">
        <property name="firstName">
            <constraint name="Length">
                <option name="min">2</option>
                <option name="max">50</option>
                <option name="minMessage">Your first name must be at least {{ limit }} characters long</option>
                <option name="maxMessage">Your first name cannot be longer than {{ limit }} characters long</option>
            </constraint>
        </property>
    </class>
</constraint-mapping>
  • PHP
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    // src/Acme/EventBundle/Entity/Participant.php
namespace Acme\EventBundle\Entity;

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

class Participant
{
    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('firstName', new Assert\Length(array(
            'min'        => 2,
            'max'        => 50,
            'minMessage' => 'Your first name must be at least {{ limit }} characters long',
            'maxMessage' => 'Your first name cannot be longer than {{ limit }} characters long',
        )));
    }
}

Options

min

type: integer

This required option is the “min” length value. Validation will fail if the given value’s length is less than this min value.

max

type: integer

This required option is the “max” length value. Validation will fail if the given value’s length is greater than this max value.

charset

type: string default: UTF-8

The charset to be used when computing value’s length. The grapheme_strlen PHP function is used if available. If not, the mb_strlen PHP function is used if available. If neither are available, the strlen PHP function is used.

minMessage

type: string default: This value is too short. It should have {{ limit }} characters or more.

The message that will be shown if the underlying value’s length is less than the min option.

maxMessage

type: string default: This value is too long. It should have {{ limit }} characters or less.

The message that will be shown if the underlying value’s length is more than the max option.

exactMessage

type: string default: This value should have exactly {{ limit }} characters.

The message that will be shown if min and max values are equal and the underlying value’s length is not exactly this value.

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