C:/xampp/htdocs/moodle/lib/zend/Zend/Validate/Db/RecordExists.php

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<?php
require_once 'Zend/Validate/Db/Abstract.php';

class Zend_Validate_Db_RecordExists extends Zend_Validate_Db_Abstract
{
    public function isValid($value)
    {
        $valid = true;
        $this->_setValue($value);

        $result = $this->_query($value);
        if (!$result) {
            $valid = false;
            $this->_error(self::ERROR_NO_RECORD_FOUND);
        }

        return $valid;
    }
}