37.3. 高级用法

<?php
require_once 'Zend/Session.php';

Zend_Session::start();
            

<?php
require_once 'Zend/Session/Namespace.php';

$userProfileNamespace = new Zend_Session_Namespace('userProfileNamespace');

// 标记会话设置为只读锁定
$userProfileNamespace->lock();

// 解锁只读锁定
if ($userProfileNamespace->isLocked()) {
$userProfileNamespace->unLock();
}
            

<?php
require_once 'Zend/Session/Namespace.php';

$s = new Zend_Session_Namespace('expireAll');
$s->a = 'apple';
$s->p = 'pear';
$s->o = 'orange';

$s->setExpirationSeconds(5, 'a'); // expire only the key "a" in 5 seconds

// 5 次访问后，会话过期
$s->setExpirationHops(5);

$s->setExpirationSeconds(60);
// 命名空间 "expireAll" 将在第一次访问后 60 秒，或者访问 5 次后过期。
            

下面的代码，作为显示一个测试问题的控制器的一部分，初始化一个布尔变量来表示是否一个提交的答案应该被接受。在此例中，给用户300秒时间来回答所显示的问题。

<?php
// ...
// in the question view controller
require_once 'Zend/Session/Namespace.php';
$testSpace = new Zend_Session_Namespace('testSpace');
$testSpace->setExpirationSeconds(300, 'accept_answer'); // expire only this variable
$testSpace->accept_answer = true;
//...
            

下面，处理测试问题答案的控制器根据用户是否在允许的时间内提交答案来决定是否接受答案：

<?php
// ...
// in the answer processing controller
require_once 'Zend/Session/Namespace.php';
$testSpace = new Zend_Session_Namespace('testSpace');
if ($testSpace->accept_answer === true) {
    // within time
}
else {
    // not within time
}
// ...
            

<?php
require_once 'Zend/Session/Namespace.php';

// create an instance of a namespace
$authSpaceAccessor1 = new Zend_Session_Namespace('Zend_Auth');

// create another instance of the same namespace, but disallow any new instances
$authSpaceAccessor2 = new Zend_Session_Namespace('Zend_Auth', true);

// making a reference is still possible
$authSpaceAccessor3 = $authSpaceAccessor2;

$authSpaceAccessor1->foo = 'bar';

assert($authSpaceAccessor2->foo, 'bar');

try {
    $aNamespaceObject = new Zend_Session_Namespace('Zend_Auth');
} catch (Zend_Session_Exception $e) {
    echo "Cannot instantiate this namespace since \$authSpaceAccessor2 was created\n";
}
            

下面来示例问题如何被复制：

<?php
require_once 'Zend/Session/Namespace.php';
$sessionNamespace = new Zend_Session_Namespace();
$sessionNamespace->array = array();
$sessionNamespace->array['testKey'] = 1; // may not work as expected before PHP 5.2.1
echo $sessionNamespace->array['testKey'];
            

如果可能，通过只在所有期望的数组值被设置后存储数组到一个会话命名空间来完全避免问题的发生。

<?php
require_once 'Zend/Session/Namespace.php';
$sessionNamespace = new Zend_Session_Namespace('Foo');
$sessionNamespace->array = array('a', 'b', 'c');
            

在下面的代码中，创建、修改了一个被存储的数组的拷贝，并且重新从被创建的拷贝分配位置、重写原数组。

<?php
require_once 'Zend/Session/Namespace.php';
$sessionNamespace = new Zend_Session_Namespace();

// assign the initial array
$sessionNamespace->array = array('tree' => 'apple');

// make a copy of the array
$tmp = $sessionNamespace->array;

// modfiy the array copy
$tmp['fruit'] = 'peach';

// assign a copy of the array back to the session namespace
$sessionNamespace->array = $tmp;

echo $sessionNamespace->array['fruit']; // prints "peach"
            

作为选择，存储一个包含引用的数组到期望的数组，然后直接访问它。

<?php
require_once 'Zend/Session/Namespace.php';
$myNamespace = new Zend_Session_Namespace('myNamespace');
$a = array(1, 2, 3);
$myNamespace->someArray = array( &$a );
$a['foo'] = 'bar';
echo $myNamespace->someArray['foo']; // prints "bar"
            

<?php
// testing setExpirationSeconds()
require_once 'tests/Zend/Session/SessionTestHelper.php'; // also see SessionTest.php
$script = 'SessionTestHelper.php';
$s = new Zend_Session_Namespace('space');
$s->a = 'apple';
$s->o = 'orange';
$s->setExpirationSeconds(5);

Zend_Session::regenerateId();
$id = Zend_Session::getId();
session_write_close(); // release session so process below can use it
sleep(4); // not long enough for things to expire
exec($script . "expireAll $id expireAll", $result);
$result = $this->sortResult($result);
$expect = ';a === apple;o === orange;p === pear';
$this->assertTrue($result === $expect,
    "iteration over default Zend_Session namespace failed; expecting result === '$expect', but got '$result'");

sleep(2); // long enough for things to expire (total of 6 seconds waiting, but expires in 5)
exec($script . "expireAll $id expireAll", $result);
$result = array_pop($result);
$this->assertTrue($result === '',
    "iteration over default Zend_Session namespace failed; expecting result === '', but got '$result')");
session_start(); // resume artificially suspended session

// We could split this into a separate test, but actually, if anything leftover from above
// contaminates the tests below, that is also a bug that we want to know about.
$s = new Zend_Session_Namespace('expireGuava');
$s->setExpirationSeconds(5, 'g'); // now try to expire only 1 of the keys in the namespace
$s->g = 'guava';
$s->p = 'peach';
$s->p = 'plum';

session_write_close(); // release session so process below can use it
sleep(6); // not long enough for things to expire
exec($script . "expireAll $id expireGuava", $result);
$result = $this->sortResult($result);
session_start(); // resume artificially suspended session
$this->assertTrue($result === ';p === plum',
    "iteration over named Zend_Session namespace failed (result=$result)");