C:/xampp/htdocs/moodle/user/filters/simpleselect.php

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<?php

require_once($CFG->dirroot.'/user/filters/lib.php');

class user_filter_simpleselect extends user_filter_type {
    var $_options;

    var $_field;

    function user_filter_simpleselect($name, $label, $advanced, $field, $options) {
        parent::user_filter_type($name, $label, $advanced);
        $this->_field   = $field;
        $this->_options = $options;
    }

    function setupForm(&$mform) {
        $choices = array(''=>get_string('anyvalue', 'filters')) + $this->_options;
        $mform->addElement('select', $this->_name, $this->_label, $choices);
        if ($this->_advanced) {
            $mform->setAdvanced($this->_name);
        }
    }

    function check_data($formdata) {
        $field = $this->_name;

        if (array_key_exists($field, $formdata) and $formdata->$field !== '') {
            return array('value'=>(string)$formdata->$field);
        }

        return false;
    }

    function get_sql_filter($data) {
        static $counter = 0;
        $name = 'ex_simpleselect'.$counter++;

        $value = $data['value'];
        $params = array();
        $field = $this->_field;
        if ($value == '') {
            return '';
        }
        return array("$field=:$name", array($name=>$value));
    }

    function get_label($data) {
        $value = $data['value'];

        $a = new stdClass();
        $a->label    = $this->_label;
        $a->value    = '"'.s($this->_options[$value]).'"';
        $a->operator = get_string('isequalto','filters');

        return get_string('selectlabel', 'filters', $a);
    }
}