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  1. <?php
  2.  
  3. class MyArray implements ArrayAccess  {
  4.   private $data = array ();
  5.   private function realOffset($offset) {
  6.     return $offset + count($this->data) * intval($offset < 0);
  7.   }
  8.   public function offsetGet ($offset) {
  9.     return $this->data[$this->realOffset($offset)];
  10.   }
  11.   public function offsetExists ($offset) {
  12.     return array_key_exists( $offset, $this->data) 
  13.         || array_key_exists(~$offset, $this->data);
  14.   }
  15.   public function offsetSet ($offset, $value) {
  16.     $this->data[$this->realOffset($offset)] = $value;
  17.   }
  18.   public function offsetUnset ($offset) {
  19.     unset($this->data[$this->realOffset($offset)]);
  20.   }
  21.   public function __construct() {
  22.     $this->data = func_get_args();
  23.   }
  24.  }
  25.  
  26. $m = new MyArray(4, 5, 6);
  27. echo sprintf("m[0] =%d, m[1] =%d, m[2] =%d\n", $m[0],  $m[1],  $m[2]);
  28. echo sprintf("m[~0]=%d, m[~1]=%d, m[~2]=%d\n", $m[~0], $m[~1], $m[~2]);
  29.  
Success #stdin #stdout 0s 82560KB
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m[0] =4, m[1] =5, m[2] =6
m[~0]=6, m[~1]=5, m[~2]=4
https://ideone.com/viiqHn
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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