note 59330 added to function.serialize
| From: | AlexanderPodgorny at osu1 dot php dot net | Date: | Sat, 03 Dec 2005 07:47:44 +0000 |
| Subject: | note 59330 added to function.serialize | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-99509@lists.php.net to get a copy of this message | ||
Here is an example of a base class to implement object persistence using serialize and unserialize:
<?
class Persistent
{
var $filename;
/**********************/
function Persistent($filename)
{
$this->filename = $filename;
if(!file_exists($this->filename)) $this->save();
}
/**********************/
function save()
{
if($f = @fopen($this->filename,"w"))
{
if(@fwrite($f,serialize(get_object_vars($this))))
{
@fclose($f);
}
else die("Could not write to file ".$this->filename." at
Persistant::save");
}
else die("Could not open file ".$this->filename." for writing, at
Persistant::save");
}
/**********************/
function open()
{
$vars = unserialize(file_get_contents($this->filename));
foreach($vars as $key=>$val)
{
eval("$"."this->$key =
$"."vars['"."$key'];");
}
}
/**********************/
}
?>
When an object is extended from this one it can be easily saved and re-opened using it's own
methods as follows:
<?
class foo extends Persistent
{
var $counter;
function inc()
{
$this->counter++;
}
}
$fooObj = new $foo;
$foo->open();
print $foo->counter; // displays incrementing integer as page reloads
$foo->inc();
$foo->save();
?>
----
Manual Page -- http://www.php.net/manual/en/function.serialize.php
Edit -- http://master.php.net/manage/user-notes.php?action=edit+59330
Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+59330&report=yes&reason=added+to+the+manual
Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+59330&report=yes&reason=bad+code
Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+59330&report=yes&reason=spam
Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+59330&report=yes&reason=useless
Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+59330&report=yes&reason=non-english
Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+59330&report=yes&reason=already+in+docs
Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+59330&report=yes
Reject -- http://master.php.net/manage/user-notes.php?action=reject+59330&report=yes
Search -- http://master.php.net/manage/user-notes.php