Simple usage of PHP in a single state mode _php tips

This article illustrates the simple use of PHP's single State pattern. Share to everyone for your reference, specific as follows:

A single State class is a class that can only be instantiated once

<?php
/* Author: 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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