access outside array variable inside class

Read this.

And you can do any one of the following:

Pass the value into the constructor as a parameter (recommended option)

<?php

$value[0]=11;
$value[1]=22;
$value[2]=33;

class test {
    var $code1,$code2,$code3;

    function __construct($value) {
            $this->code1 = $value[0];
            $this->code2 = $value[1];
            $this->code3 = $value[2];
            echo $this->code1;
        }

}

$obj = new test($value);

?>

Use the $GLOBALS array (docs)

<?php

$value[0]=11;
$value[1]=22;
$value[2]=33;

class test {
    var $code1,$code2,$code3;

    function __construct() {
            $this->code1 = $GLOBALS['value'][0];
            $this->code2 = $GLOBALS['value'][1];
            $this->code3 = $GLOBALS['value'][2];
            echo $this->code1;
        }

}

$obj = new test;

?>

Use the global keyword (docs)

<?php

$value[0]=11;
$value[1]=22;
$value[2]=33;

class test {
    var $code1,$code2,$code3;

    function __construct() {
            global $value;
            $this->code1 = $value[0];
            $this->code2 = $value[1];
            $this->code3 = $value[2];
            echo $this->code1;
        }

}

$obj = new test;

?>

NOTES

I have corrected a couple of errors above.

You should use $this->code1 instead of $this->$code1. The second version is valid syntactically, but means something else. Consider the following example:

 class myClass {

   public $myVar = "My Var";
   public $anotherVar = "Another Var";

   function __construct () {

     // creates a local variable to the constructor, called $myVar
     // does NOT overwrite the value defined above for the object property
     $myVar = "anotherVar";

     echo $myVar; // echoes 'anotherVar'
     echo $this->myVar; // echoes 'My Var'
     echo $this->$myVar; // echoes 'Another Var'

   }

 }

Also, the above example illustrates the reason why you should use echo $this->code1; and not simply echo $code1;

Something like this:

class test
{
    var $code1,$code2,$code3;

    function __construct($input)
    {
        $this->code1 = $input[0];
        $this->code2 = $input[1];
        $this->code3 = $input[2];
    }
}

[...]

$value[0]=11;
$value[1]=22;
$value[2]=33;

$test = new test($value);

Global variables aren't visible inside functions, unless you use the global keyword. e.g.:

// Global variable
$x = 5;

// Won't affect the global
function foo()
{
    $x = 3;
}

// Will affect the global
function bar()
{
    global $x;
    $x = 2;
}

Note

However, in general, it's not a good idea to use global variables like this. It introduces dependencies, and makes your code harder to test and to debug. I suggest you pass the variable in as an argument to your constructor.

class test { 
    private $code1,$code2,$code3;

    function __construct($value) {
        $this->code1 = $value[0];
        $this->code2 = $value[1];
        $this->code3 = $value[2];
        echo $this->code1;
    }
}

Usage :

$test = new Test($value);