PHP趣味开发一
最近时间有些充裕,利用PHP实现了几个有意思的东东,拿来分享一下:
<?php /** * php画个菱形 * * 思路:多少行for一次,然后在里面空格和标记符号for一次。 * * @author flyer0126 * @date 2011-12-09 * */ //上半部分 for ($i=0; $i<10; $i++){ for ($j=0; $j<9-$i; $j++){ echo " "; } for ($k=0; $k<(2*$i+1); $k++){ echo "`"; } echo "<br/>"; } //下半部分 for ($i=1; $i0; $k--){ echo "`"; } echo "<br>"; } /** * PHP实现杨辉三角 * * 思路:每一行的第一位和最后一位是1,没有变化,中间是前排一位与左边一排的和,这种算法是用一个二维数组保存,一行一行的输出。 * 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 * * @author flyer0126 * @date 2011-12-09 * */ //变量初始化 $arr = array(); //设置固定值1 for ($i=0; $i"; } /** * 在一组数中,要求插入一个数,按其原来顺序插入,维护原来排序方式。 * * 思路:找到比要插入数大的那个位置,替换,然后把后面的数后移一位。 * * @author flyer0126 * @date 2011-12-08 * */ //初始化数组变量(升序) $arr = array(1, 3, 5, 7, 9); //插入6 for ($i=0; $i<count if count for> $j+1) ? $tmp2 = $arr[$j] : ''; $arr[$j] = $tmp1; $tmp1 = $tmp2; } break; } } //输出 print_r($arr); //Array ( [0] => 1 [1] => 3 [2] => 5 [3] => 6 [4] => 7 [5] => 9 ) ?></count>

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

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.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

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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