PHP优化的点击数统计代码

<?php
error_reporting(E_ALL);
$ROOT_PATH = '../';
include_once($ROOT_PATH . "include/config.php");

$update_time = 1800;//多长时间更新一次,单位是秒

$article_id = (isset($_GET['article_id']) && is_numeric($_GET['article_id']) && $_GET['article_id'] > 0) ? intval($_GET['article_id']) : 0;//文章的ID
if ($article_id > 0) {

$filename = $ROOT_PATH . 'log/click_log.txt';
$s = '';
if (file_exists($filename)) {
$content = file_get_contents($filename);
$d_ary = array();
if ($content) {
$ary = explode("/n", $content);
foreach ($ary as $line) {
$data_ary = explode('|', $line);
if (is_numeric($data_ary[0]) && is_numeric($data_ary[1])) {
$d_ary[$data_ary[0]] = $data_ary[1];
}
}
}
if (array_key_exists($article_id, $d_ary)) {
$d_ary[$article_id] = $d_ary[$article_id]+1;//将当前的文章的点击数加1
} else {
$d_ary[$article_id] = 1;
}
foreach ($d_ary as $key => $val) {
$s .= $key . '|' . $val . "/n";
}
} else {
$s .= $article_id . '|1' . "/n";//这个是初始化记录文件
}

//写记录文件
$fp = fopen($filename, "w");
//加入锁定
if (flock($fp, LOCK_EX)) { // 进行排它型锁定
fwrite($fp, $s);
flock($fp, LOCK_UN); // 释放锁定
}
//fwrite($fp, $s);
fclose($fp);
@chmod($filename, 0777);

$last_update = file_get_contents('../log/last_update.txt');//取上一次更新的时间
$last_update = intval($last_update);
if (($last_update + $update_time) < time()) {

//以下是数据库连接操作,我用的是ADODB,你可以改成你自己的
require_once("adodb.inc.php");
$db = NewADOConnection("$DB_TYPE");
$db->debug = true;
$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
if (!$db->Connect("$DB_HOST", "$DB_USER", "$DB_PASS", "$DB_DATABASE")) {
exit('<a href="/">服务器忙,请稍候再访问</a>');
}

$content = file_get_contents($filename);
$d_ary = array();
if ($content) {
$ary = explode("/n", $content);
foreach ($ary as $line) {
$data_ary = explode('|', $line);
if (is_numeric($data_ary[0]) && is_numeric($data_ary[1])) {
$sql = "UPDATE article SET hits=hits+" . $data_ary[1] . " WHERE id=" . $data_ary[0];
$db->Execute($sql);
}
}
}
//点击数更新完了,将这个记录文件清空
$fp = fopen($filename, "w");
fwrite($fp, '');
fclose($fp);
@chmod($filename, 0777);

//将最后一次更新时间改为当前时间
$fp = fopen('../log/last_update.txt', "w");
fwrite($fp, time());
fclose($fp);
@chmod('../log/last_update.txt', 0777);

$db->Close();//关闭数据库连接
}
exit();
}
?>

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