看完台湾某大学视频一周学会PHP后的感觉
? 跟着孙仲岳先生学完PHP后(他的一周学完PHP视频),获益匪浅,总体感觉,这是一种非常实用的语言,他的开发速度远远要超过jsp。当然,本人主修的还是jsp,但是这的确不是jsp的强项,我相信任何一个人不敢说:“一周我能教会你jsp。”
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? 不用c基础,不用sql基础,当然,如果会更好,只需要短短一周,就可以学会制作一个留言板,稍微强化一点,就是一个简易论坛。我惊叹PHP的实用,因为我开发一个jsp论坛是很麻烦的事情,不说javabean,不说DBO,更不说框架,就是一个小小的导入,一个小小的xml配置文件,就会消耗大量的精力。反过来说PHP,下一个appsevr,写几个PHP页面,不需要导入库,不需要写繁琐的DBO。当然,我并不是顶PHP,我只是感叹PHP的强大,PHP在处理不需要事件页面时候的简单,超出了我的想象。我推荐大家学习一下PHP,因为你有java基础,学起来机会不用停顿,几个小时就可以轻松上手。在一些不是很严谨,或者说没有事务的时候,可以拿来代替jsp,您的开发一定会因此而节省大量的时间。
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? 本文章乃个人感想,不代表任何立场,欢迎指证,拒绝打嘴仗。社区是用来交流的,欢迎尖锐的讨论,拒绝无聊的谩骂。
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? 我的世界,因为有您的进入而精彩,我的生命,因为有您的指点而辉煌。
PS:如果哪个高人有PHP的详细语法,希望给我地址,本人十分感谢,最好是中文文档。

In PHP, you can use session_status() or session_id() to check whether the session has started. 1) Use the session_status() function. If PHP_SESSION_ACTIVE is returned, the session has been started. 2) Use the session_id() function, if a non-empty string is returned, the session has been started. Both methods can effectively check the session state, and choosing which method to use depends on the PHP version and personal preferences.

Sessionsarevitalinwebapplications,especiallyfore-commerceplatforms.Theymaintainuserdataacrossrequests,crucialforshoppingcarts,authentication,andpersonalization.InFlask,sessionscanbeimplementedusingsimplecodetomanageuserloginsanddatapersistence.

Managing concurrent session access in PHP can be done by the following methods: 1. Use the database to store session data, 2. Use Redis or Memcached, 3. Implement a session locking strategy. These methods help ensure data consistency and improve concurrency performance.

PHPsessionshaveseverallimitations:1)Storageconstraintscanleadtoperformanceissues;2)Securityvulnerabilitieslikesessionfixationattacksexist;3)Scalabilityischallengingduetoserver-specificstorage;4)Sessionexpirationmanagementcanbeproblematic;5)Datapersis

Load balancing affects session management, but can be resolved with session replication, session stickiness, and centralized session storage. 1. Session Replication Copy session data between servers. 2. Session stickiness directs user requests to the same server. 3. Centralized session storage uses independent servers such as Redis to store session data to ensure data sharing.

Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

Alternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching

Sessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.


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