singleton in php

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Elijah
14 Mar 2019
1// General singleton class.
2class Singleton {
3  // Hold the class instance.
4  private static $instance = null;
5  
6  // The constructor is private
7  // to prevent initiation with outer code.
8  private function __construct()
9  {
10    // The expensive process (e.g.,db connection) goes here.
11  }
12 
13  // The object is created from within the class itself
14  // only if the class has no instance.
15  public static function getInstance()
16  {
17    if (self::$instance == null)
18    {
19      self::$instance = new Singleton();
20    }
21 
22    return self::$instance;
23  }
24}
25 
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