mw-wp-form-forbiddenword.php

<?php
/*
  Plugin Name: MW WP Form Forbidden Word
  Plugin URI:
  Description: MW WP Formのバリデーションに「禁止ワード」を追加
  Version: 1.0.0
  Author: wararyo
  Author URI: https://github.com/wararyo
  License: GPLv2
 */

$config_class = WP_PLUGIN_DIR . '/mw-wp-form/classes/config.php';
$validation_rule_class = WP_PLUGIN_DIR . '/mw-wp-form/classes/abstract/class.validation-rule.php';
if (file_exists($config_class) && file_exists($validation_rule_class)) {
    include_once $config_class;
    include_once $validation_rule_class;
}

include_once(ABSPATH . 'wp-admin/includes/plugin.php');
if (is_plugin_active('mw-wp-form/mw-wp-form.php')) {
    class MW_WP_Form_ForbiddenWord_Validation extends MW_WP_Form_Abstract_Validation_Rule
    {
        /**
         * Validation rule name.
         *
         * @var string
         */
        protected $name = 'forbidden_word';

        /**
         * Validation process.
         *
         * @param string $name    Validation name.
         * @param array  $options Validation options.
         * @return string
         */
        public function rule($name, array $options = array())
        {
            $value = $this->Data->get($name);
            $value = MWF_Functions::convert_eol($value);

            if (MWF_Functions::is_empty($value)) {
                return;
            }

            $defaults = array(
                'words'     => 0,
                'message' => '禁止ワードが含まれています。'
            );
            $options  = array_merge($defaults, $options);
            $words = explode(",", $options['words']);
            foreach ($words as $word) {
                if (strpos($value, $word) !== false) {
                    return $options['message'];
                }
            }
        }

        /**
         * Add setting field to validation rule setting panel.
         *
         * @param numeric $key ID of validation rule.
         * @param array   $value Content of validation rule.
         * @return void
         */
        public function admin($key, $value)
        {
            $min = '';
            if (is_array($value[$this->getName()]) && isset($value[$this->getName()]['words'])) {
                $min = $value[$this->getName()]['words'];
            }
?>
            <table>
                <tr>
                    <td>禁止ワード</td>
                    <td><input type="text" value="<?php echo esc_attr($min); ?>" size="48" name="<?php echo MWF_Config::NAME; ?>[validation][<?php echo $key; ?>][<?php echo esc_attr($this->getName()); ?>][words]" /></td>
                </tr>
            </table>
    <?php
        }
    }

    function add_validation_forbidden_word_rules($validation_rules)
    {
        $instance = new MW_WP_Form_ForbiddenWord_Validation();
        $validation_rules[$instance->get_name()] = $instance;
        return $validation_rules;
    }
    add_filter('mwform_validation_rules', 'add_validation_forbidden_word_rules');
} //is_plugin_active