フォームで郵便番号フィールドの検証を追加する方法

/**
* Add zip code field validation.
*
* @link https://wpforms.com/developers/how-to-add-zip-code-field-validation-on-your-forms/
*/
 
function wpf_dev_validate_zip_code( $fields, $entry, $form_data ) {
 
    // Optional, you can limit to specific forms. Below, we restrict output to
    // form #3382.
 
    if ( absint( $form_data[ 'id' ] ) !== 3382 ) {
        return $fields;
    }
 
    // Get the value of the zip code field the user entered
    // Field ID for zip code field is '6'
    $zip_code = $fields[6][ 'value' ];
 
    // Zip code array, each zip code separated by a comma
    $zip_code_list = array(
    '85224',
    '85225',
    '85226',
    '85233',
    '85234',
    '85244',
    '85246',
    '85248',
    '85249',
    '85286',
    '85295',
    '85296',
    '85297',
    '85298',
    '85299'
    );
 
    if (!in_array($zip_code, $zip_code_list)) {
 
        // Check the field ID 75 and show an error message at the top of the form and under the specific field
        wpforms()->process->errors[ $form_data[ 'id' ] ]['6'] = esc_html__( 'We apologize for the inconvenience, but we currently do not service your area. Please check back in the future.', 'plugin-domain' );
    }
     
}
add_action( 'wpforms_process', 'wpf_dev_validate_zip_code', 10, 3 );

/**
 * Add zip code field validation across all forms, regardless of field ID.
 *
 * @link https://wpforms.com/developers/how-to-add-zip-code-field-validation-on-your-forms/
 */
function wpf_dev_validate_zip_code_all_forms( $fields, $entry, $form_data ) {

    // Define accepted labels for ZIP code fields.
    $zip_labels = array( 'zip', 'zip code', 'postal code' );

    // Find the field ID by label.
    $zip_field_id = false;
    foreach ( $form_data['fields'] as $field_id => $field ) {
        if ( isset( $field['label'] ) && in_array( strtolower( trim( $field['label'] ) ), $zip_labels, true ) ) {
            $zip_field_id = $field_id;
            break;
        }
    }

    // If no matching field is found, skip validation.
    if ( ! $zip_field_id || empty( $fields[ $zip_field_id ]['value'] ) ) {
        return $fields;
    }

    // Get the value entered by the user.
    $zip_code = trim( $fields[ $zip_field_id ]['value'] );

    // Allowed ZIP codes.
    $zip_code_list = array(
        '85224',
        '85225',
        '85226',
        '85233',
        '85234',
        '85244',
        '85246',
        '85248',
        '85249',
        '85286',
        '85295',
        '85296',
        '85297',
        '85298',
        '85299'
    );

    // Validate entered ZIP code.
    if ( ! in_array( $zip_code, $zip_code_list, true ) ) {
        wpforms()->process->errors[ $form_data['id'] ][ $zip_field_id ] = esc_html__(
            'We apologize for the inconvenience, but we currently do not service your area. Please check back in the future.',
            'plugin-domain'
        );
    }

    return $fields;
}
add_action( 'wpforms_process', 'wpf_dev_validate_zip_code_all_forms', 10, 3 );