我觉得好迷糊啊
- PHP code
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --><?php class cA { /** * Test property for using direct default value */ protected static $item = 'Foo'; /** * Test property for using indirect default value */ protected static $other = 'cA'; public static function method() { print self::$item."\r\n"; // It prints 'Foo' on everyway... :( print self::$other."\r\n"; // We just think that, this one prints 'cA' only, but... :) } public static function setOther($val) { self::$other = $val; // Set a value in this scope. } } class cB extends cA { /** * Test property with redefined default value */ protected static $item = 'Bar'; public static function setOther($val) { self::$other = $val; } } class cC extends cA { /** * Test property with redefined default value */ protected static $item = 'Tango'; public static function method() { print self::$item."\r\n"; // It prints 'Foo' on everyway... :( print self::$other."\r\n"; // We just think that, this one prints 'cA' only, but... :) } /** * Now we drop redeclaring the setOther() method, use cA with 'self::' just for fun. */ } class cD extends cA { /** * Test property with redefined default value */ protected static $item = 'Foxtrot'; /** * Now we drop redeclaring all methods to complete this issue. */ } cB::setOther('cB'); // It's cB::method()! cB::method(); // It's cA::method()! cC::setOther('cC'); // It's cA::method()! cC::method(); // It's cC::method()! cD::setOther('cD'); // It's cA::method()! cD::method(); // It's cA::method()! /** * Results: -> * Foo * cB * Tango * cC * Foo * cD * * What the hell?! :) */ ?>
这是覆盖,还是什么啊?为什么输出这样啊,不能理解啊,听乱的啊。
------解决方案--------------------
这叫什么呢?自找麻烦!
为累而累
------解决方案--------------------
不理解就算了,无所谓的事。
------解决方案--------------------
------解决方案--------------------
这样可能会清楚些
- PHP code
class cA { /** * Test property for using direct default value * 使用直接默认值测试属性 */ protected static $item = 'Foo'; /** * Test property for using indirect default value * 使用间接默认值测试属性 */ protected static $other = 'cA'; public static function method() { print __METHOD__ . ' ' . __CLASS__ . '::$item=' . self::$item."\r\n"; print __METHOD__ . ' ' . __CLASS__ . '::$otfer=' . self::$other."\r\n"; } public static function setOther($val) { self::$other = $val; // Set a value in this scope. } } class cB extends cA { /** * Test property with redefined default value * 重新定义了默认值测试属性 */ protected static $item = 'Bar'; public static function setOther($val) { self::$other = $val; } } class cC extends cA { /** * Test property with redefined default value * 重新定义了默认值测试属性 */ protected static $item = 'Tango'; public static function method() { print __METHOD__ . ' ' . __CLASS__ . '::$item=' . self::$item."\r\n"; print __METHOD__ . ' ' . __CLASS__ . '::$otfer=' . self::$other."\r\n"; } /** * Now we drop redeclaring the setOther() method, use cA with 'self::' just for fun. */ } class cD extends cA { /** * Test property with redefined default value * 重新定义了默认值测试属性 */ protected static $item = 'Foxtrot'; /** * Now we drop redeclaring all methods to complete this issue. * 现在,我们放弃重新声明的所有方法来完成这个问题 */ } cB::setOther('cB'); // It's cB::method()! cB::method(); // It's cA::method()! cC::setOther('cC'); // It's cA::method()! cC::method(); // It's cC::method()! cD::setOther('cD'); // It's cA::method()! cD::method(); // It's cA::method()! <div class="clear"> </div>

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The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

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Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.


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