note 107547 deleted from language.oop5.overloading by levim
| From: | levim@php.net | Date: | Mon, 16 Nov 2015 02:00:17 +0000 |
| Subject: | note 107547 deleted from language.oop5.overloading by levim | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-204157@lists.php.net to get a copy of this message | ||
Note Submitter: _ at apakoh dot dk
----
I find the following use of __set and __get useful:
<?php
class Post {
private $title;
private $content;
private $author;
private $comments;
private $_getters = array('title', 'content', 'author',
'comments');
private $_setters = array('title', 'content', 'author');
public function __get($property) {
if (in_array($property, $this->_setters)) {
return $this->$property;
}
else if (method_exists($this, '_get_' . $property))
return call_user_func(array($this, '_get_' . $property));
else if (in_array($property, $this->_getters) OR method_exists($this, '_set_' .
$property))
throw new Exception('Property "' . $property . '" is
write-only.');
else
throw new Exception('Property "' . $property . '" is not
accessible.');
}
public function __set($property, $value) {
if (in_array($property, $this->_getters)) {
$this->$property = $value;
}
else if (method_exists($this, '_set_' . $property))
call_user_func(array($this, '_set_' . $property), $value);
else if (in_array($property, $this->_setters) OR method_exists($this, '_get_' .
$property))
throw new Exception('Property "' . $property . '" is
read-only.');
else
throw new Exception('Property "' . $property . '" is not
accessible.');
}
}
?>
This way the variables in the $_getters array can be read from the outside and the variables in the
$_setters array can be modified from the outside, like this:
<?php
$post = new Post();
$post->title = 'Hello, World';
echo $post->title;
// The following will throw an exception since $comments is read-only:
$post->comments = 23;
?>
And in case you need a less generic getter or setter at some point, you can remove the variable from
the $_getters or $_setters array and implement a method like:
<?php
private function _set_title($value) {
$this->title = str_replace('World', 'Universe', $value);
}
?>
And from the outside the property could still be used with:
<?php
$post->title = 'Hello, World!';
?>
I've tried a couple of different ways of doing this, but this seems to be the fastest (although
still around 2 times slower than using ugly old school getter- and setter-methods).
Functions like property_exists() are unnecessary and only makes thing even slower (my initial
attempt at using __set and __get was up to 9 times slower than traditional getter/setter methods).
Could probably still be improved/changed in different ways depending on context.