basedoc_droits_context_conditions.inc.php

<?php
/**
 * Expose the myfield field value as a context condition.
 */
class basedoc_droits_has_corporate_option extends context_condition {

    /**
     * condition_values
     */
    function condition_values() {
        return array(
            'no'  => t('No'),
            'yes' => t('Yes'),
        );
    }
    /**
     * Condition form.
     */
    function condition_form($context) {


       $form = parent::condition_form($context);
       if (variable_get('VXP_institutionnel', TRUE)) {
           $default = array('no');
       } else {
           $default = array('yes');
       }
       $form['#default_value'] = $default;
       $form['#disabled'] = TRUE;
       return $form;

    }

    /**
     * function execute
     */
    function execute($value) {
       if (is_array(context_condition_map()['basedoc_droits_has_corporate_option'])) {
          foreach ($this->get_contexts($value) as $context) {
               $this->condition_met($context, $value);
           }
       }
   }

}