PHP 5.4: Accessor with trait example
<?php | |
// 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; | |
else | |
trigger_error("Access to read protected property"); | |
} | |
public function __set($name, $value) { | |
if ($this->w_property[$name]) | |
$this->$name = $value; | |
else | |
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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You can control visibility and accessibility via $r_property and $w_property. |
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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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For IDE visibility we can use PhpDoc |
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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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If you are not using getter/setter methods, I think you are killing all visibility introduced in PHP 5.