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PHP5 Singleton Design Pattern

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A Singleton design pattern in PHP.

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  1. <?php
  2. declare(strict_types=1);
  3.  
  4. /**
  5.  * Singleton design pattern implementation
  6.  */
  7. class Singleton {
  8.  
  9.   /** @var object[]  */
  10.   private static $instances = [];
  11.  
  12.   private function __construct() {
  13.   }
  14.  
  15.   /**
  16.    * @param string $class The class name to invoke
  17.    *
  18.    * @return mixed
  19.    */
  20.   public static function getInstance(string $class) {
  21.     if (!array_key_exists($class, self::$instances)) {
  22.       self::$instances[$class] = new $class();
  23.     }
  24.     return self::$instances[$class];
  25.   }
  26. }
  27.  
  28. // Usage - provide a class name to getInstance to invoke it
  29. $instance = Singleton::getInstance(Singleton::class);

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