<?php

class Qs_Validate_Percent extends Zend_Validate_Abstract
{
    const NOT_PERCENT = 'notBetween';

    protected $_messageTemplates = [
        self::NOT_PERCENT => "Field value in in wrong format",
    ];

    public function isValid($value)
    {
        $this->_setValue($value);

        if ($value < 0 || $value >= 100) {
            $this->_error(self::NOT_PERCENT);
            return false;
        }

        return true;
    }
}