Question

Hi I have problem understanding the code below:

foreach ($_POST as $field=>$value) { 
   $this->ipn_data["$field"] = $value;
   $post_string .= $field.'='.urlencode(stripslashes($value)).'&'; 
}

What does $this->ipn_data["$field"] = $value do? I need some examples to understand this.

Answer 1

The following line:

$this->ipn_data["$field"] = $value;

needs to be understood in context. The $this keyword refers to the current object in which the code is executed.

For example, consider this:

<?php

class Car {
    private $make = "Toyota";
    private $model = "Corolla";
    public function getDescription() {
        return $this->make . " " . $this->model;
    }
}

?>

In your case, the $this->ipn_data is a member of the class, and is an array. The $field is being set as the key in the array and the $value is assigned to that new key in the ipn_data array.