Validates that a given string length is between some minimum and maximum value.
Caution!
null and empty strings are not handled by this constraint. You need to
also add the :doc:`/reference/constraints/NotBlank` or :doc:`/reference/constraints/NotNull`
constraints to validate against these.
To verify that the firstName field length of a class is between "2"
and "50", you might add the following:
.. configuration-block::
.. code-block:: php-annotations
// src/AppBundle/Entity/Participant.php
namespace AppBundle\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"
* )
*/
protected $firstName;
}
.. code-block:: yaml
# src/AppBundle/Resources/config/validation.yml
AppBundle\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'
.. code-block:: xml
<!-- src/AppBundle/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="AppBundle\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
</option>
</constraint>
</property>
</class>
</constraint-mapping>
.. code-block:: php
// src/AppBundle/Entity/Participant.php
namespace AppBundle\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',
)));
}
}
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.
It is important to notice that NULL values and empty strings are considered valid no matter if the constraint required a minimum length. Validators are triggered only if the value is not blank.
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.
type: string default: UTF-8
The charset to be used when computing value's length. The :phpfunction:`grapheme_strlen` PHP function is used if available. If not, the :phpfunction:`mb_strlen` PHP function is used if available. If neither are available, the :phpfunction:`strlen` PHP function is used.
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.
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.
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.