


[ 2006/04/09 21:46 | by andyli ]
Collection, good stuff
/**********************
*
* author : Emerald
*
* homepage : http://gi.2288.org:88/
*
* sitename : Green Institute - Green Institute
*
* date : 2005-2-11 2:27:18
*
* PHP server variable: $_SERVER
*
*************** *****/
echo Related to document root.
.$_SERVER['argv'].'
' #Parameters passed to the script.
.$_SERVER['argc'].'
' #Contains the number of command line parameters passed to the program (if running in command line mode).
.$_SERVER['GATEWAY_INTERFACE'].'
' #The version of the CGI specification used by the server. For example, "CGI/1.1".
.$_SERVER['SERVER_NAME'].'
' #The name of the server host where the script is currently running.
.$_SERVER['SERVER_SOFTWARE'].'
' #The string of server identification, given in the header when responding to the request.
.$_SERVER['SERVER_PROTOCOL'].'
' #The name and version of the communication protocol when requesting the page. For example, "HTTP/1.0".
.$_SERVER['REQUEST_METHOD'].'
' #Request method when accessing the page. For example: "GET", "HEAD", "POST", "PUT".
.$_SERVER['QUERY_STRING'].'
' #Query string.
.$_SERVER['DOCUMENT_ROOT'].'
' #The document root directory where the currently running script is located. Defined in the server configuration file.
.$_SERVER['HTTP_ACCEPT'].'
' #The content of the Accept: header of the current request.
.$_SERVER['HTTP_ACCEPT_CHARSET'].'
' #The content of the Accept-Charset: header of the current request. For example: "iso-8859-1,*,utf-8".
.$_SERVER['HTTP_ACCEPT_ENCODING'].'
'#The content of the Accept-Encoding: header of the current request. For example: "gzip".
.$_SERVER['HTTP_ACCEPT_LANGUAGE'].'
'#The content of the Accept-Language: header of the current request. For example: "en".
.$_SERVER['HTTP_CONNECTION'].'
' #The content of the Connection: header of the current request. For example: "Keep-Alive".
.$_SERVER['HTTP_HOST'].'
' #The content of the Host: header of the current request.
.$_SERVER['HTTP_REFERER'].'
' #The URL address of the previous page linked to the current page.
.$_SERVER['HTTP_USER_AGENT'].'
' #The content of the User_Agent: header of the current request.
.$_SERVER['REMOTE_ADDR'].'
' #The IP address of the user who is browsing the current page.
.$_SERVER['REMOTE_HOST'].'
' #The host name of the user who is browsing the current page.
.$_SERVER['REMOTE_PORT'].'
' #The port used by users to connect to the server.
.$_SERVER['SCRIPT_FILENAME'].'
' #The absolute path name of the currently executing script.
.$_SERVER['SERVER_ADMIN'].'
' #Administrator information
.$_SERVER['SERVER_PORT'].'
' #The port used by the server
.$_SERVER['SERVER_SIGNATURE'].'
' # A string containing the server version and virtual hostname.
.$_SERVER['PATH_TRANSLATED'].'
' #The base path of the file system (not the document root directory) where the current script is located.
.$_SERVER['SCRIPT_NAME'].'
' #Contains the path of the current script. This is useful when the page needs to point to itself.
.$_SERVER['REQUEST_URI'].'
' #The URI required to access this page. For example, "/index.html".
.$_SERVER['PHP_AUTH_USER'].'
'
#When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the username entered by the user.
.$_SERVER['PHP_AUTH_PW'].'
'
#When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
.$_SERVER['AUTH_TYPE'].'
'
#When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the authentication type.
$_SERVER['PHP_SELF'].'
' #The file name of the currently executing script, related to document root.
?>
The above introduces the 500 internal server error server variable compiled by others: $_SERVER, including the content of 500 internal server error. I hope it will be helpful to friends who are interested in PHP tutorials.

ThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin

You should care about DependencyInjection(DI) because it makes your code clearer and easier to maintain. 1) DI makes it more modular by decoupling classes, 2) improves the convenience of testing and code flexibility, 3) Use DI containers to manage complex dependencies, but pay attention to performance impact and circular dependencies, 4) The best practice is to rely on abstract interfaces to achieve loose coupling.

Yes,optimizingaPHPapplicationispossibleandessential.1)ImplementcachingusingAPCutoreducedatabaseload.2)Optimizedatabaseswithindexing,efficientqueries,andconnectionpooling.3)Enhancecodewithbuilt-infunctions,avoidingglobalvariables,andusingopcodecaching

ThekeystrategiestosignificantlyboostPHPapplicationperformanceare:1)UseopcodecachinglikeOPcachetoreduceexecutiontime,2)Optimizedatabaseinteractionswithpreparedstatementsandproperindexing,3)ConfigurewebserverslikeNginxwithPHP-FPMforbetterperformance,4)

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl


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