Simple usage of PHP single state mode

This article mainly introduces the simple usage of PHP monomorphic mode, and analyzes the definition and related usage skills of PHP monomorphic mode in the form of examples. Friends in need can refer to it

Monomorphic classes can only Class instantiated once

<?php
/*
作者 : shyhero
*/
class Demo{
    private static $ob=null;
    private $name;
    private $age;
    private function __construct(){
    }
    public static function makeOb(){
      var_dump($a);
      if(self::$ob == null){
        $c = __CLASS__;
        self::$ob = new $c();
      }
      return self::$ob;
    }
    public function __set($tName,$value){
      $this -> $tName = $value;
    }
}
$a = Demo::makeOb();
var_dump($a);

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