PHP对象试图访问外部数组

I have an Object that needs to access a previously declared array in my statistics. I can of course create the entire array inside of the object, but since multiple objects use the exact same array there is no reason to clog up memory or time by making a call to the Database to create the same array every time I create a new object.

So, I understood that Objects cannot access global variables, but is there any work-around to access an external Array from within the object?

example Code:

global $stats = array();
       $stats[1]['value']= 10;
       $stats[1]['value1'] =2;
       $stats[2]['value']= 12;
       $stats[2]['value1'] =1;

class Obj() {

  private $valueA;
  private $valueB;

  function __construct($user) {
    //access Database lets call $SQL;
    $valueA = SQL->value;

  }

  function showA() {
    return ( $valueA * $stats[1]['value1']) + $stats[1]['value'];
  }

}

Thanks to Mike, Sheikh and Kristian,

I can't in all Faith give a tick to your answers, because your words did not help me to understand the answer, Putting 'global $stats;' into the class results in an Error which I pointed out in my responses. but I will 'up' your scores when I permission from the site to do so.

For anyone looking for the answer to this, a Reminder, the key point is not to store the entire Array in the class, creating a huge waste of memory. The Key point is to gain access to the Variable which exists outside of the class.

While adding access to the global $stats by including it in the functions of the class, does produce the required results, It still requires that the Data is being stored in the class, which is again, against the point. Sorry I wasn't clear on this from the very beginning.

Instead:

example Code:

 function showA(&$stats) {
   return ( $valueA * $stats[1]['value1']) + $stats[1]['value'];
 }

}

This, if I understand correctly, will use the pointer to the $stats variable, only within the scope of returning the $valueA after it has been modified using the stats array. not copying the entire array into another memory location, nor the class.

Yes how about changing your class to look like this:

class Obj() {

  private $valueA;
  private $valueB;
  private $stats;

  function __construct($user, $stats) {
    $this->stats = $stats;
    //access Database lets call $SQL;
    $valueA = SQL->value * $this->stats[1]['value1'] + $this->stats[1]['value'];
    $valueB = SQL->value * $this->stats[2]['value1'] + $this->stats[2]['value'];
  }

  function showA() {
    return $valueA;
  }

}

You than just pass $stats to the object at instantiation. Or if you don't want it in the constructor, just make a setStats($stats) method that does the same.

I'll tell you three ways to do this:

1. pass the array into the constructor of the class. e.g.: $myObject = new Obj( $stats );
2. make a class that serves up the $stats array: $stats = new Stats(); $statsArray = $stats->getStats();

3. use the term global inside of a public method in your class itself (not construct) to get that variable: 3:

   function() somePublicMethod() {
       global $stats;
       $valueA = SQL->value * $stats[1]['value1'] + $stats[1]['value'];
       $valueB = SQL->value * $stats[2]['value1'] + $stats[2]['value'];
   }
   

You can access variables from within a class, i.e.

$stats[1]['value']= 10;
$stats[1]['value1'] =2;
$stats[2]['value']= 12;
$stats[2]['value1'] =1;

class Obj {
    var $myStats;
    function __construct() {
        global $stats;
        $this->myStats= $stats;
        print_r($this->myStats);
    }
}

$obj=new Obj; // Array ( [1] => Array ( [value] => 10 [value1] => 2 ) [2] => Array ( [value] => 12 [value1] => 1 ) )

DEMO.