This is a simple example of how to implement serialization using the __sleep and __wakeup magic methods...
<?php
//student.class.php
class Student{
private $full_name = '';
private $score = 0;
private $grades = array();
public function __construct($full_name, $score, $grades)
{
$this->full_name = $full_name;
$this->grades = $grades;
$this->score = $score;
}
public function show()
{
echo $this->full_name;
}
function __sleep()
{
echo 'Going to sleep...';
return array('full_name', 'grades', 'score');
}
function __wakeup()
{
echo 'Waking up...';
}
}
?>
<?php
//a.php
include 'student.class.php';
$student = new Student('bla bla', 'a', array('a' => 90, 'b' => 100));
$student->show();
echo "<br />\n";
$s = serialize($student);
echo $s ."<br />\n";
$fp = fopen('./uploads/session.s', 'w');
fwrite($fp, $s);
fclose($fp);
?>
<?php
//b.php
include 'student.class.php';
$s = implode('', file("./uploads/session.s"));
echo $s ."<br />\n";
$a = unserialize($s);
$a->show();
?>
References inside the constructor
Serializing objects - objects in sessions
[edit] Last updated: Fri, 28 Jun 2013
Serializing objects - objects in sessions
[edit] Last updated: Fri, 28 Jun 2013
The magic functions __sleep and __wakeup
serialize() checks if your class has a function with
the magic name __sleep. If so, that function is
being run prior to any serialization. It can clean up the object
and is supposed to return an array with the names of all variables
of that object that should be serialized.
If the method doesn't return anything then NULL is serialized and
E_NOTICE is issued.
The intended use of __sleep is to commit pending data or perform similar cleanup tasks. Also, the function is useful if you have very large objects which need not be saved completely.
Conversely, unserialize() checks for the presence of a function with the magic name __wakeup. If present, this function can reconstruct any resources that object may have.
The intended use of __wakeup is to reestablish any database connections that may have been lost during serialization and perform other reinitialization tasks.
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User Contributed Notes
The magic functions __sleep and __wakeup - [1 notes]
ranware2200 at yahoo dot com ¶
2 years ago