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PHP 5.4: Accessor with trait example
// Example code how to eliminate getter and setter methods
// with traits introduced from PHP 5.4
trait Accessors {
public function __get($name) {
if ($this->r_property[$name])
return $this->$name;
trigger_error("Access to read protected property");
public function __set($name, $value) {
if ($this->w_property[$name])
$this->$name = $value;
trigger_error("Access to write protected property");
class OrderLine {
use Accessors;
private $r_property = array('price'=>1, 'amount'=>1);
private $w_property = array('price'=>0, 'amount'=>1);
protected $price;
private $amount;
private $tax = 1.15; // property without getter/setter
public function getTotal() {
return $this->price * $this->amount * $this->tax;
$line = new OrderLine;
$line->price = 20;
$line->amount = 3;
echo "Total cost: ".$line->getTotal();
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kassner commented Nov 20, 2011

If you are not using getter/setter methods, I think you are killing all visibility introduced in PHP 5.

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yohgaki commented Nov 20, 2011

You can control visibility and accessibility via $r_property and $w_property.
This code is example to show how we can avoid getter and setter methods with trait.

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kassner commented Nov 20, 2011

Oh, yes, we will spent less time writing getters and setters, but we will lose visibility in our IDE. This doesn't sounds useful. However, it is a good traits usage example.

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anyt commented Dec 29, 2013

For IDE visibility we can use PhpDoc

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jon49 commented Oct 16, 2014

How would you do inheritance with this (assuming you are using Accessor in both the parent and the child)? Or is it even possible?

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