note 59330 modified in function.serialize by danbrown
| From: | danbrown@php.net | Date: | Mon, 20 Jun 2011 15:26:03 +0000 |
| Subject: | note 59330 modified in function.serialize by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-180762@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:
<?php
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();
?>
--was--
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();
?>
http://php.net/manual/en/function.serialize.php