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PHP Singleton Class

Published in: PHP

Not extensively tested but should work just fine!

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<?php
 
    /**
     * Singleton object. Usage:
     * $objInstance = Singleton::getInstance('ClassName');
     */
    class Singleton {
 
        private static $arrInstances = array();
 
        private function __construct() {
        }
 
        public function getInstance($strClassName) {
            $strClassNameKey = strtolower($strClassName);
            if (!array_key_exists($strClassNameKey, self::$arrInstances)) {
                self::$arrInstances[$strClassNameKey] = new $strClassName;
            }
            return self::$arrInstances[$strClassNameKey];
        }
    }
 
?>

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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).