How to use PHP arrays to implement browser caching and page staticization

How to use PHP arrays to implement browser caching and page staticization

In web development, browser caching and page staticization are important methods to improve webpage loading speed. PHP is a commonly used server-side scripting language. It provides rich array functions and can easily implement browser caching and page staticization. This article will introduce how to use PHP arrays to implement these two functions and give corresponding code examples.

1. Browser caching

Browser caching refers to temporarily storing the content of the page in the browser. When the user visits the same page again, if the page content has not changed, the user can directly access the page from Read from the cache to speed up page loading. In PHP, we can use arrays to implement simple browser caching functions.

The following is a sample code:

<?php
// 检查是否存在缓存
function checkCache($key, $expire = 3600){
  if(isset($_SESSION[$key])){
    $timeDiff = time() - $_SESSION[$key]['time'];
    
    // 如果缓存未过期，则返回缓存内容
    if($timeDiff < $expire){
      return $_SESSION[$key]['content'];
    }
  }
  return false;
}

// 设置缓存
function setCache($key, $content){
  $_SESSION[$key] = [
    'time' => time(),
    'content' => $content
  ];
}
?>

For each page that needs to be cached, we can call the checkCache function to check whether there is a cache. If the cache exists and has not expired, the cached content is returned directly; otherwise, the page content is continued to be generated and the setCache function is used to store the content in the cache.

2. Page staticization

Page staticization refers to saving the dynamically generated page content as a static file and directly accessing the file, thereby avoiding regenerating the page with each request. PHP arrays can be used to save generated page content and output it as a static file.

The following is a sample code:

<?php
// 生成页面内容
function generatePage(){
  $content = "这是一个动态生成的页面。";
  return $content;
}

// 保存为静态文件
function saveAsStaticPage($content, $filename){
  // 将内容保存到文件中
  file_put_contents($filename, $content);
}

// 输出静态文件
function outputStaticPage($filename){
  // 直接输出静态文件内容
  readfile($filename);
}
?>

When generating page content, we can use the generatePage function to complete the generation of dynamic content. Then, call the saveAsStaticPage function to save the content as a static file for later access. Finally, you can use the outputStaticPage function to directly output the static file content.

3. Use browser caching and page staticization in combination

Browser caching and page staticization can be used in combination to improve webpage loading speed. The following is a comprehensive application sample code:

<?php
// 检查缓存
$cacheKey = 'page_cache';
if($cache = checkCache($cacheKey)){
  // 如果有缓存，直接输出缓存内容
  outputStaticPage($cache);
}else{
  // 生成页面内容
  $content = generatePage();
  
  // 保存为静态文件
  $filename = 'static/page.html';
  saveAsStaticPage($content, $filename);
  
  // 设置缓存
  setCache($cacheKey, $filename);
  
  // 输出静态文件
  outputStaticPage($filename);
}
?>

In this example, first check whether there is a cache. If there is a cache, the cached content is output directly; otherwise, the page content is generated, saved as a static file and cached. Then, output the static file content again.

Summary:

By using PHP arrays, we can easily implement browser caching and page static functions, thereby improving web page loading speed. In practical applications, we can make appropriate optimization and adjustments according to specific needs to achieve better results. At the same time, we should also pay attention to the timeliness of the cache and update the cached content in a timely manner to ensure the accuracy of the page content.

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