[李景山php]每天laravel-20161008|Validator.php-8

    /**     * Validate an attribute is contained within a list of values.     *     * @param  string  $attribute     * @param  mixed   $value     * @param  array   $parameters     * @return bool     */    protected function validateIn($attribute, $value, $parameters)    {        if (is_array($value) && $this->hasRule($attribute, 'Array')) {            return count(array_diff($value, $parameters)) == 0;        }// if it is value and this get the count        return ! is_array($value) && in_array((string) $value, $parameters);    }//validate an attribute is contained within a list of values    // i like this two way , just return this result    /**     * Validate an attribute is not contained within a list of values.     *     * @param  string  $attribute     * @param  mixed   $value     * @param  array   $parameters     * @return bool     */    protected function validateNotIn($attribute, $value, $parameters)    {        return ! $this->validateIn($attribute, $value, $parameters);// return a wrap function    }//validate an attribute is not contained within a list of values    /**     * Validate the uniqueness of an attribute value on a given database table.     *     * If a database column is not specified, the attribute will be used.     *     * @param  string  $attribute     * @param  mixed   $value     * @param  array   $parameters     * @return bool     */    // validate the uniqueness of an attribute value on a given database table.    // if a database column is not specified, the attribute will be used.    protected function validateUnique($attribute, $value, $parameters)    {        $this->requireParameterCount(1, $parameters, 'unique');//get this function        list($connection, $table) = $this->parseTable($parameters[0]);// list some method        // The second parameter position holds the name of the column that needs to        // be verified as unique. If this parameter isn't specified we will just        // assume that this column to be verified shares the attribute's name.        $column = isset($parameters[1]) ? $parameters[1] : $attribute;        // The second parameter position holds the name of the column that needs to        // be verified as unique. If this parameter isn't specified we will just        // assume that this column to be verified shares the attribute's name.        list($idColumn, $id) = [null, null];// init this parameter        if (isset($parameters[2])) {            list($idColumn, $id) = $this->getUniqueIds($parameters);//a good method            if (strtolower($id) == 'null') {                $id = null;            }// set the number        }        // The presence verifier is responsible for counting rows within this store        // mechanism which might be a relational database or any other permanent        // data store like Redis, etc. We will use it to determine uniqueness.        $verifier = $this->getPresenceVerifier();//get Presence Verifier        $verifier->setConnection($connection);// set Connection        $extra = $this->getUniqueExtra($parameters);//get Unique Extra        return $verifier->getCount(            $table, $column, $value, $id, $idColumn, $extra        ) == 0;// get Count    }// so powerfull    /**     * Parse the connection / table for the unique / exists rules.     *     * @param  string  $table     * @return array     */    protected function parseTable($table)    {        return Str::contains($table, '.') ? explode('.', $table, 2) : [null, $table];    }//Parse the connection table for the unique and exists rules.