note 105300 deleted from language.oop5.static by cmb
| From: | cmb@php.net | Date: | Sun, 01 Sep 2019 07:15:36 +0000 |
| Subject: | note 105300 deleted from language.oop5.static by cmb | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-212041@lists.php.net to get a copy of this message | ||
Note Submitter: programmer-comfreek at hotmail dot com
----
If you haven't an instance for your class (e.g. all functions are static), but you also want a
__destruct() functionality, consider the following example:
We have a class which loads and saves data so we also want to have an autosave mechanism which is
called at the end of the PHP script.
So usually you declare a __destruct function but our class is designed to provide static functions /
variables instead:
<?php
class A
{
static private $autoSave;
static public function init($autoSave)
{
/* emulating __construct() */
self::$autoSave = $autoSave;
}
static public function save() { /*...*/ } /* load(), get(), etc. */
}
?>
In order to define a __destruct function (which is definitely called) we create a new instance in
the init() function and define a destruct() function (which is called from the 'real'
one):
<?php
class B
{
static private $autoSave;
static public function init($autoSave)
{
/* emulating __construct() */
self::$autoSave = $autoSave;
new B();
}
static public function destruct()
{
if (self::$autoSave)
self::save();
}
public function __destruct()
{
B::destruct();
}
}
?>