How to count the number of online users of a website using php _ PHP Tutorial

Php allows you to count the number of online users of a website. Php: how to count the number of online users of a website this article describes how to count the number of online users of a website in php. Share it with you for your reference. The specific implementation method is as follows :? 1234 how php calculates the number of online users of a website

This example describes how to use php to count the number of online users of a website. Share it with you for your reference. The specific implementation method is as follows:

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Function getIpAddress () {// obtain the IP address of the current user If (getenv ('http _ CLIENT_IP ')){ $ Ip = getenv ('http _ CLIENT_IP '); } Elseif (getenv ('http _ X_FORWARDED_FOR ')){ $ Ip = getenv ('http _ X_FORWARDED_FOR '); } Elseif (getenv ('remote _ ADDR ')){ $ Ip = getenv ('remote _ ADDR '); } Else { $ Ip = $ _ SERVER ['remoe _ ADDR ']; } Return $ ip; } Function writeover ($ filename, $ data, $ method = 'W', $ chmod = 0 ){ $ Handle = fopen ($ filename, $ method ); ! Handle & die ("file opening failed "); Flock ($ handle, LOCK_EX ); Fwrite ($ handle, $ data ); Flock ($ handle, LOCK_UN ); Fclose ($ handle ); $ Chmod & @ chmod ($ filename, 0777 ); } Function count_online_num ($ time, $ ip ){ $ FileCount = './count.txt '; $ Count = 0; $ Gap = 900; // Click it in 15 minutes. If (! File_exists ($ fileCount )){ $ Str = $ time. "\ t". $ ip. "\ r \ n "; Writeover ($ fileCount, $ str, 'W', 1 ); $ Count = 1; } Else { $ Arr = file ($ fileCount ); $ Flag = 0; Foreach ($ arr as $ key => $ val ){ $ Val = trim ($ val ); If ($ val! = ""){ List ($ when, $ seti) = explode ("\ t", $ val ); If ($ seti ==$ ip ){ $ Arr [$ key] = $ time. "\ t". $ seti; $ Flag = 1; } Else { $ CurrentTime = time (); If ($ currentTime-$ when> 900 ){ Unset ($ arr [$ key]); } Else { $ Arr [$ key] = $ val; } } } } If ($ flag = 0 ){ Array_push ($ arr, $ time. "\ t". $ ip ); } $ Count = count ($ arr ); $ Str = implode ("\ r \ n", $ arr ); $ Str. = "\ r \ n "; Writeover ($ fileCount, $ str, 'W', 0 ); Unset ($ arr ); } Return $ count; } $ Time = time (); $ Ip = getIpAddress (); $ Online_num = count_online_num ($ time, $ ip ); Echo $ online_num; ?>

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Examples in this article describes how php can calculate the number of online users of a website. Share it with you for your reference. The specific implementation method is as follows :? 1 2 3 4...