php 统计访问次数

<?php
$counterFile = 'counter.txt';

if (file_exists($counterFile)) {
    $counter = file_get_contents($counterFile);
    $counter++;
} else {
    $counter = 1;
}

file_put_contents($counterFile, $counter);

echo "访问次数: " . $counter;
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "SELECT counter FROM visit_counter";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    $counter = $row['counter'] + 1;
} else {
    $counter = 1;
}

$sql = "UPDATE visit_counter SET counter = $counter";
$conn->query($sql);

echo "访问次数: " . $counter;

$conn->close();
?>

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$counter = $redis->get('visit_counter');

if ($counter === false) {
    $counter = 1;
} else {
    $counter++;
}

$redis->set('visit_counter', $counter);

echo "访问次数: " . $counter;
?>