Question

class_1.php

class class_1
{
    public function __construct()
    {
        require_once $_SERVER['DOCUMENT_ROOT'].'/array.php';
    }
}

class_2.php

class class_2
{
    static function output_array()
    {
        return $array_NUMBERS;
    }
}

array.php

$array_NUMBERS = array('1', '2', '3');

page.php

require_once $_SERVER['DOCUMENT_ROOT'].'/class_1.php';

require_once $_SERVER['DOCUMENT_ROOT'].'/class_2.php';

$obj = new class_1();

$numbers = class_2::output_array();

echo '<pre>';
print_r($numbers);

What am I doing wrong here? Aren’t you supposed to use “require_once” within classes?

Problem: It’s not outputting the array values.

Answer 1

You’re creating a local variable in class_1::__construct(), which falls out of scope immediately and is lost forever.

Even if it weren’t, variables declared inside a function are local to that function, and cannot be access from other functions. class_2::output_array() has no concept of the variable $array_NUMBERS. You need to read up on scope.

To make this work, you’d have to make the variable a public member of class_1:

class class_1 {
    public $array_NUMBERS;
    function __construct() {
        require_once('array.php');
    }
}

class class_2 {
    public static function output_array() {
        $class1 = new class_1();
        return $class1->array_NUMBERS;
    }
}

array.php:

$this->array_NUMBERS = array(...);