max_length

type: integer

This option is used to add a maxlength attribute, which is used by some browsers to limit the amount of text in a field.

required

type: Boolean default: true

If true, an HTML5 required attribute will be rendered. The corresponding label will also render with a required class.

This is superficial and independent from validation. At best, if you let Symfony guess your field type, then the value of this option will be guessed from your validation information.

label

type: string default: The label is "guessed" from the field name

Sets the label that will be used when rendering the field. The label can also be directly set inside the template:

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{{ form_label(form.name, 'Your name') }}

trim

type: Boolean default: true

If true, the whitespace of the submitted string value will be stripped via the trim() function when the data is bound. This guarantees that if a value is submitted with extra whitespace, it will be removed before the value is merged back onto the underlying object.

read_only

type: Boolean default: false

If this option is true, the field will be rendered with the readonly attribute so that the field is not editable.

disabled

type: boolean default: false

If you don't want a user to modify the value of a field, you can set
the disabled option to true. Any submitted value will be ignored.

error_bubbling

type: Boolean default: false unless the form is compound

If true, any errors for this field will be passed to the parent field or form. For example, if set to true on a normal field, any errors for that field will be attached to the main form, not to the specific field.

error_mapping

type: array default: empty

This option allows you to modify the target of a validation error.

Imagine you have a custom method named matchingCityAndZipCode that validates whether the city and zip code match. Unfortunately, there is no "matchingCityAndZipCode"
field in your form, so all that Symfony can do is display the error on top of the form.

With customized error mapping, you can do better: map the error to the city field so that it displays above it:

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public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        'error_mapping' => array(
            'matchingCityAndZipCode' => 'city',
        ),
    ));
}

Here are the rules for the left and the right side of the mapping:

• The left side contains property paths.
• If the violation is generated on a property or method of a class, its path is simply "propertyName".
• If the violation is generated on an entry of an array or ArrayAccess object, the property path is [indexName].
• You can construct nested property paths by concatenating them, separating properties by dots. For example: addresses[work].matchingCityAndZipCode
• The left side of the error mapping also accepts a dot ., which refers to the field itself. That means that any error added to the field is added to the given nested field instead.
• The right side contains simply the names of fields in the form.

mapped

type: boolean

If you wish the field to be ignored when reading or writing to the object, you can set the mapped option to false.