singleton in php

// General singleton class.
class Singleton {
  // Hold the class instance.
  private static $instance = null;
  
  // The constructor is private
  // to prevent initiation with outer code.
  private function __construct()
  {
    // The expensive process (e.g.,db connection) goes here.
  }
 
  // The object is created from within the class itself
  // only if the class has no instance.
  public static function getInstance()
  {
    if (self::$instance == null)
    {
      self::$instance = new Singleton();
    }
 
    return self::$instance;
  }
}

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singleton in php

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