PHP PHP Singleton类

Posted 2021-05-15

<?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];
        }
    }

?>