PHP目录下php-config的作用
1. php-config简介
php安装完后在bin目录下有个php-config。
php-config是一个脚本文件。用于获取所安装的php配置的信息。
2. 使用场景
在编译php扩展时,使用下面命令用于指定php-config的路径。
./configure --with-php-config=/home/gang/php/bin/php-config
3. php-config使用选项
在命令行执行
$ ./php-config
返回所有选项:
Options: --prefix [...] PHP 所安装的路径前缀 --includes [...] 列出用 -I 选项包含的所有文件 --ldflags [...] PHP 编译时所使用的 LD 标志 --libs [...] PHP 编译时所附加的库 --extension-dir [...] 扩展库的默认路径 --include-dir [...] 头文件的默认路径前缀 --php-binary [...] PHP CLI 或者 CGI 可执行文件的完整路径 --php-sapis [...] 列出所有可用的 SAPI 模块 --configure-options [...] 重现当前 PHP 在编译时的配置选项 --version [...] PHP 版本号 --vernum [...] PHP 版本号,以整数表示
4. 查看php-config代码
php-config就是一个脚本文件,可以直接查看他的代码内容
vim php-config可以看到里面的变量在安装php脚本时已经生成了。
From:http://blog.csdn.net/yonggang7/article/details/24106681

PHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.

TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.

PHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.

PHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita


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