PHP中 getenv() 取得系统的环境变量(预定义变量)
$_SERVER['SERVER_NAME']
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$spager=getenv('SERVER_NAME');delphi.xcjc.net7 R- N, u4 @: z2 F2 x. R: L
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“PHP_SELF”delphi.xcjc.net% u, @4 p- D- m4 L
当前正在执行脚本的文件名,与 document root 相关。举例来说,在 URL 地址为 http://example.com/test.php/foo.bar 的脚本中使用 $_SERVER['PHP_SELF'] 将会得到 /test.php/foo.bar 这个结果。__FILE__ 常量包含当前(例如包含)文件的绝对路径和文件名。
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如果 PHP 以命令行方式运行,该变量在 PHP 4.3.0 之前无效。
“argv”
传递给该脚本的参数。当脚本运行在命令行方式时,argv 变量传递给程序 C 语言样式的命令行参数。当调用 GET 方法时,该变量包含请求的数据。% A; T' O+ s' D2 Q6 v9 @+ G+ N* {
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“argc”Delphi Tips, Delphi Skills, Delphi技巧, Delphi问答, Delphi技术, cjc delphi' t) v# j ] _* n! D! b
包含传递给程序的命令行参数的个数(如果运行在命令行模式)。) P4 h" x% Q0 H2 \/ n" N5 l) A
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“GATEWAY_INTERFACE”Delphi Tip, Delphi Skills, Delphi技巧+ }6 Y+ Y3 e* c
服务器使用的 CGI 规范的版本。例如,“CGI/1.1”。CJC Delphi 技巧馆. y+ Y. g8 [, u |
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“SERVER_NAME”
当前运行脚本所在服务器主机的名称。如果该脚本运行在一个虚拟主机上,该名称是由那个虚拟主机所设置的值决定。CJC Delphi 技巧馆# I. A4 B9 z8 c
“SERVER_SOFTWARE”
服务器标识的字串,在响应请求时的头信息中给出。
“SERVER_PROTOCOL”delphi.xcjc.net9 \" ^7 W. K: \/ ]$ s5 _$ _
请求页面时通信协议的名称和版本。例如,“HTTP/1.0”。delphi.xcjc.net B& [4 m% m* l
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“REQUEST_METHOD”
访问页面时的请求方法。例如:“GET”、“HEAD”,“POST”,“PUT”。
注: 如果请求的方式是 HEAD,PHP 脚本将在送出头信息后中止(这意味着在产生任何输出后,不再有输出缓冲)。Delphi Tips, Delphi Skills, Delphi技巧, Delphi问答, Delphi技术, cjc delphi/ W5 [0 l! o4 [, y3 V5 A9 C
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“REQUEST_TIME”

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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