PHP date and time, PHP date and time
1, date
<span>string</span> <span>date</span> ( <span>string</span> <span>$format</span> [, int <span>$timestamp</span> ] )
echo date('Y') . '<br/>';// 2016<br /> echo date('y') . '<br/>';// 16<br /><br /> echo '------<br/>';<br /><br /> echo date('m') . '<br/>';// 03<br /> echo date('M') . '<br/>';// Mar, 大写M表示月份的3个缩写字符<br /> echo date('n') . '<br/>';// 3, <br /> echo date('F') . '<br/>';// March, 月份的英文全写<br /><br /> echo '------<br/>';<br /><br /> echo date('d') . '<br/>';// 09<br /> echo date('j') . '<br/>';// 9<br /> echo date('S') . '<br/>';// th,表示日期的后缀。<br /><br /> echo '------<br/>';<br /><br /> echo date('g') . '<br/>';// 4, 12小时制,前不带0<br /> echo date('G') . '<br/>';// 16, 24小时制,带前导0<br /> echo date('H') . '<br/>';// 16,24小时制,前不带0<br /> echo date('h') . '<br/>';// 01, 12小时制,带前导0<br /><br /> echo '------<br/>';<br /><br /> echo date('i') . '<br/>';// 42,分钟<br /><br /> echo '------<br/>';<br /><br /> echo date('s') . '<br/>';// 26,秒<br /> echo date('S') . '<br/>';// th,表示日期的后缀。<br /><br /> echo '------<br/>';<br /><br /> echo date('a') . '<br/>';// pm,小写的am(上午)pm(下午)<br /> echo date('A') . '<br/>';// PM,大写<br /><br /> echo '------<br/>';<br /><br /> echo date('l') . '<br/>';// Thursday,当天是星期几的英文全写(Tuesday)<br /> echo date('L') . '<br/>';// 1,闰年则返回1否则0<br /> echo date('D') . '<br/>';// Thu,表示星期几的3个字符缩写(Tue)<br /> <br /><br />
2. mktime()
mktime generates a timestamp for the specified time, prototype:
int mktime ([ int $hour = date("H") [, int $minute = date("i") [, int $second = date("s") [,int $month = date("n") [, int $day = date("j") [, int $year = date("Y") [, int $is_dst = -1]]]]]]] )
$tomorrow = mktime(0,0,0,date("m"),date("d")+1,date("Y"));<br />echo "明天是 ".date("Y/m/d", $tomorrow);
3. strtotime()
$d=strtotime("10:38pm April 15 2015");<br />echo "创建日期是 " . date("Y-m-d h:i:sa", $d);<br /><br />$d=strtotime("tomorrow");<br />echo date("Y-m-d h:i:sa", $d) . "<br>";<br /><br />$d=strtotime("next Saturday");<br />echo date("Y-m-d h:i:sa", $d) . "<br>";<br /><br />$d=strtotime("+3 Months");<br />echo date("Y-m-d h:i:sa", $d) . "<br>";<br /><br />

Thedifferencebetweenunset()andsession_destroy()isthatunset()clearsspecificsessionvariableswhilekeepingthesessionactive,whereassession_destroy()terminatestheentiresession.1)Useunset()toremovespecificsessionvariableswithoutaffectingthesession'soveralls

Stickysessionsensureuserrequestsareroutedtothesameserverforsessiondataconsistency.1)SessionIdentificationassignsuserstoserversusingcookiesorURLmodifications.2)ConsistentRoutingdirectssubsequentrequeststothesameserver.3)LoadBalancingdistributesnewuser

PHPoffersvarioussessionsavehandlers:1)Files:Default,simplebutmaybottleneckonhigh-trafficsites.2)Memcached:High-performance,idealforspeed-criticalapplications.3)Redis:SimilartoMemcached,withaddedpersistence.4)Databases:Offerscontrol,usefulforintegrati

Session 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.

PHPsessionsstartwithsession_start(),whichgeneratesauniqueIDandcreatesaserverfile;theypersistacrossrequestsandcanbemanuallyendedwithsession_destroy().1)Sessionsbeginwhensession_start()iscalled,creatingauniqueIDandserverfile.2)Theycontinueasdataisloade

Absolute 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.

The 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.

session_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

Notepad++7.3.1
Easy-to-use and free code editor

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

WebStorm Mac version
Useful JavaScript development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)
