note 61130 deleted from language.oop5.magic by cmb
| From: | cmb@php.net | Date: | Sun, 10 Nov 2019 12:40:37 +0000 |
| Subject: | note 61130 deleted from language.oop5.magic by cmb | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-212990@lists.php.net to get a copy of this message | ||
Note Submitter: b dot schoppmeier at bas-consult dot de
----
The sequence of events regarding __sleep and __destruct is unusual __ as __destruct is called before
__sleep. The following code snippet:
<?php
$sequence = 0;
class foo {
public $stuff;
public function __construct($param) {
global $sequence;
echo "Seq: ", $sequence++, " - constructor\n";
$this->stuff = $param;
}
public function __destruct() {
global $sequence;
echo "Seq: ", $sequence++, " - destructor\n";
}
public function __sleep() {
global $sequence;
echo "Seq: ", $sequence++, " - __sleep\n";
return array("stuff");
}
public function __wakeup() {
global $sequence;
echo "Seq: ", $sequence++, " - __wakeup\n";
}
}
session_start();
$_SESSION["obj"] = new foo("A foo");
?>
yields the output:
Seq: 0 - constructor
Seq: 1 - destructor
Seq: 2 - __sleep
Only when you end your script with a call to session_write_close() as in:
<?php
$sequence = 0;
class foo {
public $stuff;
public function __construct($param) {
global $sequence;
echo "Seq: ", $sequence++, " - constructor\n";
$this->stuff = $param;
}
public function __destruct() {
global $sequence;
echo "Seq: ", $sequence++, " - destructor\n";
}
public function __sleep() {
global $sequence;
echo "Seq: ", $sequence++, " - __sleep\n";
return array("stuff");
}
public function __wakeup() {
global $sequence;
echo "Seq: ", $sequence++, " - __wakeup\n";
}
}
session_start();
$_SESSION["obj"] = new foo("A foo");
session_write_close();
?>
the sequence is as common sense would expect it to be as the following output shows:
Seq: 0 - constructor
Seq: 1 - __sleep
Seq: 2 - destructor