Image

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Image

The Image constraint works exactly like the File constraint, except that its mimeTypes and mimeTypesMessage options are automatically setup to work for image files specifically.

Additionally, as of Symfony 2.1, it has options so you can validate against the width and height of the image.

See the File constraint for the bulk of the documentation on this constraint.

Applies to property or method
Options
Class Image
Validator ImageValidator

Basic Usage

This constraint is most commonly used on a property that will be rendered in a form as a file form type. For example, suppose you're creating an author form where you can upload a "headshot" image for the author. In your form, the headshot property would be a file type. The Author class might look as follows:

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

use Symfony\Component\HttpFoundation\File\File;

class Author
{
    protected $headshot;

    public function setHeadshot(File $file = null)
    {
        $this->headshot = $file;
    }

    public function getHeadshot()
    {
        return $this->headshot;
    }
}

To guarantee that the headshot File object is a valid image and that it is between a certain size, add the following:

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    // src/AppBundle/Entity/Author.php
    namespace AppBundle\Entity;
    
    use Symfony\Component\Validator\Constraints as Assert;
    
    class Author
    {
        /**
         * @Assert\Image(
         *     minWidth = 200,
         *     maxWidth = 400,
         *     minHeight = 200,
         *     maxHeight = 400
         * )
         */
        protected $headshot;
    }
    
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    # src/AppBundle/Resources/config/validation.yml
    AppBundle\Entity\Author:
        properties:
            headshot:
                - Image:
                    minWidth: 200
                    maxWidth: 400
                    minHeight: 200
                    maxHeight: 400
    
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    <!-- 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\Author">
            <property name="headshot">
                <constraint name="Image">
                    <option name="minWidth">200</option>
                    <option name="maxWidth">400</option>
                    <option name="minHeight">200</option>
                    <option name="maxHeight">400</option>
                </constraint>
            </property>
        </class>
    </constraint-mapping>
    
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    // src/AppBundle/Entity/Author.php
    namespace AppBundle\Entity;
    
    use Symfony\Component\Validator\Mapping\ClassMetadata;
    use Symfony\Component\Validator\Constraints\Image;
    
    class Author
    {
        public static function loadValidatorMetadata(ClassMetadata $metadata)
        {
            $metadata->addPropertyConstraint('headshot', new Image(array(
                'minWidth' => 200,
                'maxWidth' => 400,
                'minHeight' => 200,
                'maxHeight' => 400,
            )));
        }
    }
    

The headshot property is validated to guarantee that it is a real image and that it is between a certain width and height.

Options

This constraint shares all of its options with the File constraint. It does, however, modify two of the default option values and add several other options.

mimeTypes

type: array or string default: image/*

You can find a list of existing image mime types on the IANA website.

mimeTypesMessage

type: string default: This file is not a valid image.

minWidth

type: integer

If set, the width of the image file must be greater than or equal to this value in pixels.

maxWidth

type: integer

If set, the width of the image file must be less than or equal to this value in pixels.

minHeight

type: integer

If set, the height of the image file must be greater than or equal to this value in pixels.

maxHeight

type: integer

If set, the height of the image file must be less than or equal to this value in pixels.

sizeNotDetectedMessage

type: string default: The size of the image could not be detected.

If the system is unable to determine the size of the image, this error will be displayed. This will only occur when at least one of the four size constraint options has been set.

maxWidthMessage

type: string default: The image width is too big ({{ width }}px). Allowed maximum width is {{ max_width }}px.

The error message if the width of the image exceeds maxWidth.

minWidthMessage

type: string default: The image width is too small ({{ width }}px). Minimum width expected is {{ min_width }}px.

The error message if the width of the image is less than minWidth.

maxHeightMessage

type: string default: The image height is too big ({{ height }}px). Allowed maximum height is {{ max_height }}px.

The error message if the height of the image exceeds maxHeight.

minHeightMessage

type: string default: The image height is too small ({{ height }}px). Minimum height expected is {{ min_height }}px.

The error message if the height of the image is less than minHeight.

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