How to implement statistics on the number of people online on a website in PHP_PHP Tutorial

How to use php to count the number of people online on a website

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

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function getIpAddress() { // 取得当前用户的IP地址 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, $method); !handle && die("文件打开失败"); flock($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; $gap = 900; //15分钟不刷新页面就 if (!file_exists($fileCount)) { $str = $time . "t" . $ip . "rn"; writeover($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("rn", $arr); $str.="rn"; writeover($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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<🎜>function getIpAddress() { // Get the current user’s IP address<🎜> <🎜>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; //If you don’t refresh the page for 15 minutes<🎜> <🎜>if (!file_exists($fileCount)) {<🎜> <🎜>$str = $time . "t" . $ip . "rn";<🎜> <🎜>writeover($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("rn", $arr); $str.="rn"; writeover($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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