php实现统计网站在线人数的方法

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<?php

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 . "\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;

?>