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Detailed explanation of Zend_Session session operation in Zend Framework introductory tutorial

高洛峰
高洛峰Original
2017-01-06 10:02:371849browse

本文实例讲述了Zend Framework入门教程之Zend_Session会话操作。分享给大家供大家参考,具体如下:

会话命名空间

实现会话

代码:

<?php
require_once "Zend/Session/Namespace.php";
$myNamespace = new Zend_Session_Namespace(&#39;Myspace&#39;);
if(isset($myNamespace->numberOfPageRequests))
{
  $myNamespace->numberOfPageRequests++;
}else{
  $myNamespace->numberOfPageRequests = 1;
}
echo "用户的浏览次数为:";
echo "<font size=\"6\" color=\"#ff0000\">";
echo $myNamespace->numberOfPageRequests;
echo "</font>次";

结果:

用户的浏览次数为:10次

遍历会话命名空间

代码:

<?php
require_once "Zend/Session/Namespace.php";
$myNamespace = new Zend_Session_Namespace(&#39;Myspace&#39;);
$myNamespace->webhost = "127.0.0.1";
$myNamespace->hostname = "localhost";
$myNamespace->user = "root";
$myNamespace->password = "123456";
$myNamespace->db_name = "test";
$myNamespace->db_type = "Sqlite";
foreach($myNamespace as $index=>$value){
  echo "命名空间myNamespace中的:".$index;
  echo "为".$value."<p>\n";
}

结果:

命名空间myNamespace中的:webhost为127.0.0.1
命名空间myNamespace中的:hostname为localhost
命名空间myNamespace中的:user为root
命名空间myNamespace中的:password为123456
命名空间myNamespace中的:db_name为test
命名空间myNamespace中的:db_type为Sqlite

点评:

它会把这个对象所对应空间中的所有内容遍历出来。很神奇。

访问会话命名空间

代码:

<?php
require_once "Zend/Session/Namespace.php";
$login = new Zend_Session_Namespace(&#39;other&#39;);
$login->user = "Administrator";
if(isset($login->user)){
  echo "\$login->user已经有值,其值为:";
  echo $login->user;
  unset($login->user);
}else{
  echo "\$login->user无值";
}
echo "<p>";
if(isset($login->pass)){
  echo "\$login->pass已经有值,其值为:";
  echo $login->pass;
  unset($login->pass);
}else{
  echo "\$login->pass无值";
}
foreach($login as $index=>$value){
  echo "命名空间login中的:".$index."为".$value."<p>\n";
}

结果:

$login->user已经有值,其值为:Administrator
$login->pass无值

会话的高级应用

开启会话,有两种方法

一、使用Zend_Session::start()开启会话

二、new Zend_Session_Namespace()

锁定会话命名空间

代码:

<?php
require_once "Zend/Session/Namespace.php";
$test = new Zend_Session_Namespace(&#39;test&#39;);
$test->name = "玉皇大帝";
$test->sex = "男";
$test->lock();
if($test->isLocked()){
  echo "会话\$test已经锁定!<p>";
  echo "命名空间\$test中的成员name的值为:";
  echo $test->name;
}else{
  echo "会话\$test已经解锁!";
}
echo "<p>";
$test->unLock();
if($test->isLocked()){
  echo "会话\$test已经锁定!<p>";
  echo "命名空间\$test中的成员name的值为:";
  echo $test->name;
}else{
  echo "会话\$test已经解锁!";
}

结果:

会话$test已经锁定!

命名空间$test中的成员name的值为:玉皇大帝

会话$test已经解锁!

点评:

由此可见,锁定并不影响结果的输出。

分析源代码

public function lock()
{
    self::$_namespaceLocks[$this->_namespace] = true;
}
/**
* unlock() - unmark a session/namespace to enable read & write
*
* @return void
*/
public function unlock()
{
    unset(self::$_namespaceLocks[$this->_namespace]);
}
/**
* unlockAll() - unmark all session/namespaces to enable read & write
*
* @return void
*/
public static function unlockAll()
{
    self::$_namespaceLocks = array();
}
/**
* isLocked() - return lock status, true if, and only if, read-only
*
* @return bool
*/
public function isLocked()
{
    return isset(self::$_namespaceLocks[$this->_namespace]);
}

可知,它只是改变了参数而已。

为会话设置生命周期

setExpirationSeconds()方法与setExpirationHops()两种方法来设置。

代码:

<?php
require_once "Zend/Session/Namespace.php";
$s = new Zend_Session_Namespace(&#39;temp&#39;);
$s->a = "苹果";
$s->p = "梨";
$s->o = "桔子";
$s->setExpirationSeconds(60);
$s->setExpirationHops(2,&#39;a&#39;);
$s->setExpirationHops(3,&#39;p&#39;);
echo "已经为命名空间\$s设置生命期<p>";

设置生命期代码,其实它针对的是命名空间来设置的。

测试代码:

<?php
require_once "Zend/Session/Namespace.php";
$b = new Zend_Session_Namespace(&#39;temp&#39;);
echo "\$b->a内容为:".$b->a;
echo "<p>";
echo "\$b->p内容为:".$b->p;

先执行设置生命期代码,在执行测试代码会看到效果。

第一次:
$b->a内容为:苹果
$b->p内容为:梨
第二次:
$b->a内容为:苹果
$b->p内容为:梨
第三次:
$b->a内容为:
$b->p内容为:梨
第四次:
$b->a内容为:
$b->p内容为:

点评:刷新两次之后,就会有消失。之后陆续消失。超过60秒效果相同。

分析源代码,

public function setExpirationSeconds($seconds, $variables = null)
{
    if (parent::$_writable === false) {
      /**
       * @see Zend_Session_Exception
       */
      require_once &#39;Zend/Session/Exception.php&#39;;
      throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
    }
    if ($seconds <= 0) {
      /**
       * @see Zend_Session_Exception
       */
      require_once &#39;Zend/Session/Exception.php&#39;;
      throw new Zend_Session_Exception(&#39;Seconds must be positive.&#39;);
    }
    if ($variables === null) {
      // apply expiration to entire namespace
      $_SESSION[&#39;__ZF&#39;][$this->_namespace][&#39;ENT&#39;] = time() + $seconds;
    } else {
      if (is_string($variables)) {
        $variables = array($variables);
      }
      foreach ($variables as $variable) {
        if (!empty($variable)) {
          $_SESSION[&#39;__ZF&#39;][$this->_namespace][&#39;ENVT&#39;][$variable] = time() + $seconds;
        }
      }
    }
}

其实它还是基于PHP原始的Session来实现的。只是扩展了部分功能。

public function setExpirationHops($hops, $variables = null, $hopCountOnUsageOnly = false)
{
    if (parent::$_writable === false) {
      /**
       * @see Zend_Session_Exception
       */
      require_once &#39;Zend/Session/Exception.php&#39;;
      throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
    }
    if ($hops <= 0) {
      /**
       * @see Zend_Session_Exception
       */
      require_once &#39;Zend/Session/Exception.php&#39;;
      throw new Zend_Session_Exception(&#39;Hops must be positive number.&#39;);
    }
    if ($variables === null) {
      // apply expiration to entire namespace
      if ($hopCountOnUsageOnly === false) {
        $_SESSION[&#39;__ZF&#39;][$this->_namespace][&#39;ENGH&#39;] = $hops;
      } else {
        $_SESSION[&#39;__ZF&#39;][$this->_namespace][&#39;ENNH&#39;] = $hops;
      }
    } else {
      if (is_string($variables)) {
        $variables = array($variables);
      }
      foreach ($variables as $variable) {
        if (!empty($variable)) {
          if ($hopCountOnUsageOnly === false) {
            $_SESSION[&#39;__ZF&#39;][$this->_namespace][&#39;ENVGH&#39;][$variable] = $hops;
          } else {
            $_SESSION[&#39;__ZF&#39;][$this->_namespace][&#39;ENVNH&#39;][$variable] = $hops;
          }
        }
      }
    }
}

处理放在了构造函数中。

希望本文所述对大家基于Zend Framework框架的PHP程序设计有所帮助。

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