# Limit Phone Number Field Length in WordPress Forms

Original URL: https://www.fireplugins.com/docs/howto/limit-phone-number-field-length/
Last updated: 2025-05-23T12:12:24+03:00

This article will guide you on how to limit the Phone Number field length in your FireBox WordPress form.

 ## Enable PHP Scripts

 This guide requires that PHP Scripts be enabled to perform these validations. To enable PHP Scripts, go to FireBox > Settings > Advanced > enable PHP Scripts.

  ## How to Limit the Phone Number Field by Characters

 To limit a phone number form field and require up to X characters, edit your FireBox campaign, go to PHP Scripts section > Form Process, and add:

 ```
// Enter your phone number field name
$phone_number_field_name = 'phonenumber';

// Enter the maximum number of characters allowed in the phone number field
$phone_number_characters_limit = 10;

// Enter the error message to be displayed if the phone number exceeds the limit
$phone_number_error_message = 'The phone number field can contain up to 10 characters';

// Do not edit below
if (isset($values[$phone_number_field_name]) && is_array($values[$phone_number_field_name]) && isset($values[$phone_number_field_name]['value']) && strlen($values[$phone_number_field_name]['value']) > $phone_number_characters_limit) {
    throw new \Exception($phone_number_error_message);
}
```

 You must set up the following:

 - Set your phone number field name in $phone_number_field_name
- Set the max characters allowed in $phone_number_characters_limit
- Set the error message that will appear when the criteria are not met in $phone_number_error_message

 ## Other Guides

 - [Limit Characters or Words in WordPress Form Fields](https://www.fireplugins.com/docs/howto/limit-characters-words-form-fields/)