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11 years ago
Something that has not been discussed so far is reference of a reference.
I needed a quick and dirty method of aliasing incorrect naming until a proper rewrite could be done.
Hope this saves someone else the time of testing since it was not covered in the Does/Are/Are Not pages.
Far from best practice, but it worked.

<?php
$a = 0;

$b =& $a;
$a =& $b;

$a = 5;
echo $a . ', ' . $b;
//ouputs: 5,5

echo ' | ';

$b = 6;
echo $a . ',' . $b;
//outputs: 6,6

echo ' | ';
unset( $a );
echo $a . ', ' . $b;

//outputs: , 6 

class Product {

    public $id;
    private $productid;

    public function __construct( $id = null ) {
        $this->id =& $this->productid;
        $this->productid =& $this->id;
        $this->id = $id;
    }

    public function getProductId() {
        return $this->productid;
    }

}

echo ' | ';

$Product = new Product( 1 );
echo $Product->id . ', ' . $Product->getProductId();
//outputs 1, 1
$Product->id = 2;
echo ' | ';
echo $Product->id . ', ' . $Product->getProductId();
//outputs 2, 2
$Product->id = null;
echo ' | ';
echo $Product->id . ', ' . $Product->getProductId();
//outouts ,
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