C:/xampp/htdocs/moodle/user/profile/field/menu/field.class.php

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<?php

class profile_field_menu extends profile_field_base {
    var $options;
    var $datakey;

    function profile_field_menu($fieldid=0, $userid=0) {
        //first call parent constructor
        $this->profile_field_base($fieldid, $userid);

        $options = explode("\n", $this->field->param1);
        $this->options = array();
        if ($this->field->required){
            $this->options[''] = get_string('choose').'...';
        }
        foreach($options as $key => $option) {
            $this->options[$key] = format_string($option);//multilang formatting
        }

        if ($this->data !== NULL) {
            $this->datakey = (int)array_search($this->data, $this->options);
        }
    }

    function edit_field_add(&$mform) {
        $mform->addElement('select', $this->inputname, format_string($this->field->name), $this->options);
    }

    function edit_field_set_default(&$mform) {
        if (FALSE !==array_search($this->field->defaultdata, $this->options)){
            $defaultkey = (int)array_search($this->field->defaultdata, $this->options);
        } else {
            $defaultkey = '';
        }
        $mform->setDefault($this->inputname, $defaultkey);
    }

    function edit_save_data_preprocess($key) {
        return isset($this->options[$key]) ? $this->options[$key] : NULL;
    }

    function edit_load_user_data(&$user) {
        $user->{$this->inputname} = $this->datakey;
    }

    function edit_field_set_locked(&$mform) {
        if (!$mform->elementExists($this->inputname)) {
            return;
        }
        if ($this->is_locked() and !has_capability('moodle/user:update', get_context_instance(CONTEXT_SYSTEM))) {
            $mform->hardFreeze($this->inputname);
            $mform->setConstant($this->inputname, $this->datakey);
        }
    }
}