Curl command to check the request response time
# curl -o /dev/null -s -w %{time_namelookup}::%
{time_connect}::%{time_starttransfer}::%{time_total}::%{speed_download}"\n"
http://www.php.cn
0.014::0.015::0.018::0.019::1516256.00-o: Write the html and js returned by curl to the garbage collection bin [/dev/null]
-s: Remove all status
-w: Follow the following format Write rt
time_namelookup: The time when DNS resolves the domain name www.php.cn
time_commect: The time when the client and server establish a TCP connection
time_starttransfer: Make a request from the client; respond to the first byte of the web server Time
time_total: The client sends a request; the time it takes to send all the corresponding data to the web server
speed_download: Next week’s speed unit is byte/s
The above command and the return result can be understood like this:
0.014: The time unit for the DNS server to resolve www.php.cn is s
0.015: the time when the client issues a request and c/s establishes TCP; it includes the time of DNS resolution
0.018: when the client issues a request; when the first s response is issued The time when bytes start; including the previous 2 times
0.019: client sends a request; s sends all response data to the client; and closes the connect time
1516256.00: the speed of downloading data
Establishing a TCP connection The time for the server to return the first byte of the client: 0.018s – 0.015s = 0.003s
The time for the server to send the response data to the client: 0.019s – 0.018 = 0.01s
The above is to use the Curl command to check the request response time The content of the method, please pay attention to the PHP Chinese website (www.php.cn) for more related content!
Related articles:
What is the difference between unset() and session_destroy()?May 04, 2025 am 12:19 AMThedifferencebetweenunset()andsession_destroy()isthatunset()clearsspecificsessionvariableswhilekeepingthesessionactive,whereassession_destroy()terminatestheentiresession.1)Useunset()toremovespecificsessionvariableswithoutaffectingthesession'soveralls
What is sticky sessions (session affinity) in the context of load balancing?May 04, 2025 am 12:16 AMStickysessionsensureuserrequestsareroutedtothesameserverforsessiondataconsistency.1)SessionIdentificationassignsuserstoserversusingcookiesorURLmodifications.2)ConsistentRoutingdirectssubsequentrequeststothesameserver.3)LoadBalancingdistributesnewuser
What are the different session save handlers available in PHP?May 04, 2025 am 12:14 AMPHPoffersvarioussessionsavehandlers:1)Files:Default,simplebutmaybottleneckonhigh-trafficsites.2)Memcached:High-performance,idealforspeed-criticalapplications.3)Redis:SimilartoMemcached,withaddedpersistence.4)Databases:Offerscontrol,usefulforintegrati
What is a session in PHP, and why are they used?May 04, 2025 am 12:12 AMSession in PHP is a mechanism for saving user data on the server side to maintain state between multiple requests. Specifically, 1) the session is started by the session_start() function, and data is stored and read through the $_SESSION super global array; 2) the session data is stored in the server's temporary files by default, but can be optimized through database or memory storage; 3) the session can be used to realize user login status tracking and shopping cart management functions; 4) Pay attention to the secure transmission and performance optimization of the session to ensure the security and efficiency of the application.
Explain the lifecycle of a PHP session.May 04, 2025 am 12:04 AMPHPsessionsstartwithsession_start(),whichgeneratesauniqueIDandcreatesaserverfile;theypersistacrossrequestsandcanbemanuallyendedwithsession_destroy().1)Sessionsbeginwhensession_start()iscalled,creatingauniqueIDandserverfile.2)Theycontinueasdataisloade
What is the difference between absolute and idle session timeouts?May 03, 2025 am 12:21 AMAbsolute session timeout starts at the time of session creation, while an idle session timeout starts at the time of user's no operation. Absolute session timeout is suitable for scenarios where strict control of the session life cycle is required, such as financial applications; idle session timeout is suitable for applications that want users to keep their session active for a long time, such as social media.
What steps would you take if sessions aren't working on your server?May 03, 2025 am 12:19 AMThe server session failure can be solved through the following steps: 1. Check the server configuration to ensure that the session is set correctly. 2. Verify client cookies, confirm that the browser supports it and send it correctly. 3. Check session storage services, such as Redis, to ensure that they are running normally. 4. Review the application code to ensure the correct session logic. Through these steps, conversation problems can be effectively diagnosed and repaired and user experience can be improved.
What is the significance of the session_start() function?May 03, 2025 am 12:18 AMsession_start()iscrucialinPHPformanagingusersessions.1)Itinitiatesanewsessionifnoneexists,2)resumesanexistingsession,and3)setsasessioncookieforcontinuityacrossrequests,enablingapplicationslikeuserauthenticationandpersonalizedcontent.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
Zend Studio 13.0.1
Powerful PHP integrated development environment
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
