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Posted By

DaveChild on 09/17/08


Tagged

Singleton


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PHP Singleton Class

 / Published in: PHP
 

Not extensively tested but should work just fine!

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  1. <?php
  2.  
  3.     /**
  4.      * Singleton object. Usage:
  5.      * $objInstance = Singleton::getInstance('ClassName');
  6.      */
  7.     class Singleton {
  8.  
  9.         private static $arrInstances = array();
  10.  
  11.         private function __construct() {
  12.         }
  13.  
  14.         public function getInstance($strClassName) {
  15.             $strClassNameKey = strtolower($strClassName);
  16.             if (!array_key_exists($strClassNameKey, self::$arrInstances)) {
  17.                 self::$arrInstances[$strClassNameKey] = new $strClassName;
  18.             }
  19.             return self::$arrInstances[$strClassNameKey];
  20.         }
  21.     }
  22.  
  23. ?>

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Posted By: MichaelR on December 22, 2009

It should be:

public STATIC function getInstance ($strClassName) { ... }

(Capitalization just to emphasize my fix).

Posted By: MichaelR on December 22, 2009

Note; you can also define the class as abstract, and then not need to have a private __construct().

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