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  1. <?php
  2.     class Base {
  3.         private static $cache = array();
  4.  
  5.         public function &__get($name) {
  6.             if ($name != 'cache') {
  7.                 // error handling
  8.             }
  9.  
  10.             $type = get_class($this);
  11.             if (!isset(self::$cache[$type])) {
  12.                 self::$cache[$type] = array();
  13.             }
  14.  
  15.             return self::$cache[$type];
  16.         }
  17.     }
  18.  
  19.     class Derived extends Base {
  20.     }
  21.  
  22.     $b = new Base;
  23.     $b2 = new Base;
  24.     $d = new Derived;
  25.     $b->cache['foo'] = 42;
  26.  
  27.     echo $b->cache['foo']."\n";  // 42
  28.     echo $b2->cache['foo']."\n"; // also 42
  29.     echo $d->cache['foo']."\n";  // nothing (actually, undefined index); cache is per-class
  30.  
Success #stdin #stdout 0.02s 13112KB
comments (?)
stdin 
Standard input is empty
stdout 
42
42
https://ideone.com/XREa7
language:
PHP (php 7.3.5)
created:
13 years ago
visibility:
public

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