<?php

/**

 * This class stands for ApprovalStatus EnumType

 * @subpackage Enumerations

 */

class ApprovalStatus

{

    /**

     * Constant for value 'Pending'

     * @return string 'Pending'

     */

    const VALUE_PENDING = 'Pending';

    /**

     * Constant for value 'Approved'

     * @return string 'Approved'

     */

    const VALUE_APPROVED = 'Approved';

    /**

     * Constant for value 'Declined'

     * @return string 'Declined'

     */

    const VALUE_DECLINED = 'Declined';

    /**

     * Return true if value is allowed

     * @uses self::getValidValues()

     * @param mixed $value value

     * @return bool true|false

     */

    public static function valueIsValid($value)

    {

        return ($value === null) || in_array($value, self::getValidValues(), true);

    }

    /**

     * Return allowed values

     * @uses self::VALUE_PENDING

     * @uses self::VALUE_APPROVED

     * @uses self::VALUE_DECLINED

     * @return string[]

     */

    public static function getValidValues()

    {

        return array(

            self::VALUE_PENDING,

            self::VALUE_APPROVED,

            self::VALUE_DECLINED,

        );

    }

    /**

     * Method returning the class name

     * @return string __CLASS__

     */

    public function __toString()

    {

        return __CLASS__;

    }

}

​