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unserialize

(PHP 3>= 3.0.5, PHP 4 , PHP 5)

unserialize -- Creates a PHP value from a stored representation

Description

mixed unserialize ( string str )

unserialize() takes a single serialized variable (see serialize()) and converts it back into a PHP value. The converted value is returned, and can be an integer, float, string, array or object. In case the passed string is not unserializeable, FALSE is returned.

unserialize_callback_func directive: It's possible to set a callback-function which will be called, if an undefined class should be instantiated during unserializing. (to prevent getting an incomplete object "__PHP_Incomplete_Class".) Use your php.ini, ini_set() or .htaccess to define 'unserialize_callback_func'. Everytime an undefined class should be instantiated, it'll be called. To disable this feature just empty this setting. Also note that the directive unserialize_callback_func directive became available in PHP 4.2.0.

If the variable being unserialized is an object, after successfully reconstructing the object PHP will automatically attempt to call the __wakeup() member function (if it exists).

Пример 1. unserialize_callback_func example


<?php

$serialized_object
=
'O:1:"a":1:{s:5:"value";s:3:"100";}'
;




// unserialize_callback_func directive available as of PHP 4.2.0


ini_set
(
'unserialize_callback_func'
, 
'mycallback'
); 
// set your callback_function




function 
mycallback
(
$classname
) 

{

    
// just include a file containing your classdefinition

    // you get $classname to figure out which classdefinition is required


}


?>

Замечание: In PHP 3, methods are not preserved when unserializing a serialized object. That limitation was removed in PHP 4 as both properties and methods are now restored. Please see the Serializing Objects section of Classes and Objects or more information.

Пример 2. unserialize() example


<?php


// Here, we use unserialize() to load session data to the

// $session_data array from the string selected from a database.

// This example complements the one described with serialize().




$conn 
= 
odbc_connect
(
"webdb"
, 
"php"
, 
"chicken"
);


$stmt 
= 
odbc_prepare
(
$conn
, 
"SELECT data FROM sessions WHERE id = ?"
);


$sqldata 
= array (
$PHP_AUTH_USER
);

if (!
odbc_execute
(
$stmt
, &
$sqldata
) || !
odbc_fetch_into
(
$stmt
, &
$tmp
)) {

    
// if the execute or fetch fails, initialize to empty array

    
$session_data 
= array();

} else {

    
// we should now have the serialized data in $tmp[0].

    
$session_data 
= 
unserialize
(
$tmp
[
0
]);

    if (!
is_array
(
$session_data
)) {

        
// something went wrong, initialize to empty array

        
$session_data 
= array();

    }

}


?>

Смотрите также serialize().

Все функции PHP: