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下面是单件模式在PHP中的几种实现方法：

class Stat{    static $instance = NULL;       static function getInstance(){        if(self::$instance == NULL){            self::$instance = new Stat();        }               return self::$instance;    }       private function __construct(){    }       private function __clone(){    }          function sayHi(){        return "The Class is saying hi to u ";    }}echo Stat::getInstance()->sayHi();

这是一种最通常的方式，在一个getInstance方法中返回唯一的类实例。

class Teacher{    function sayHi(){        return "The teacher smiling and said 'Hello '";    }       static function getInstance(){        static $instance;               if(!isset($instance)){            $c = __CLASS__;            $instance = new $c;        }               return $instance;    }}echo Teacher::getInstance()->sayHi();

class singleton{    function getInstance($class){        static $instances = array();        if(!array_key_exists($class,$instances)){            $instances[$class] = &new $class;        }        $instance = $instances[$class];               return $instance;    }}class People{    function sayHi(){        return 'Hello i am a people?';    }}echo "
";echo singleton::getInstance('People')->sayHi();

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