php - trying to understand some functions related to zend - 


/**     * getter method, same offsetget().     *     * method can called object of type zend_registry, or     * can called statically.  in latter case, uses default     * static instance stored in class.     *     * @param string $index - value associated $index     * @return mixed     * @throws zend_exception if no entry registerd $index.     */ public static function get($index)     {         $instance = self::getinstance();          if (!$instance->offsetexists($index))         {             if ($instance->lazyload($index, $return))             {                 return $return;             }             else             {                 throw new zend_exception("no entry registered key '$index'");             }         }          return $instance->offsetget($index);     } ... public static function getdb()     {         return self::get('db');     }  ...

this taken xenforo/application.php, although comment clear, still have questions:

  1. $instance = self::getinstance(); line mean here?
  2. $instance->lazyload; not find declaration of method:lazyload, zend file?
  3. $instance->offsetget($index), saw declaration in spl.php, is:
    public function offsetget ($index) {}, empty inside {}, how function?

here brief explanation threee question

1. $instance = self::getinstance(); line mean here?

answer 1. getinstance method used class instance without doing $test = new class_name(); getinstance method static can class instance without declaring new class_name(); in getinstance method checking _instance set? if not set create own class instance , return instance.

2. $instance->lazyload; not find declaration of method:lazyload, zend file?

answer 2. can understand lazyload below link have better idea lazyload. link

3. $instance->offsetget($index), saw declaration in spl.php, is: public function offsetget ($index) {}, empty inside {}, how function?

answer 3. method can called object of type zend_registry, or can called statically. in latter case, uses default static instance stored in class.

parameters: string $index - value associated $index returns: mixed exceptions: zend_exception if no entry registerd $index.

pls let me know if more..


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