How to use PHP and CGI to implement the search function of the website

How to use PHP and CGI to implement the search function of the website

In the modern Internet era, the search function of the website is indispensable. Users can quickly find the information they need through the search function, which improves user experience. This article will introduce how to use PHP and CGI to implement the search function of the website.

1. Concepts of PHP and CGI

PHP (full name PHP: Hypertext Preprocessor) is a widely used open source scripting language that can be embedded into HTML and used to process the Web Dynamic generation of pages.

CGI (full name: Common Gateway Interface) is a standard interface between web servers and applications. It allows the web server to dynamically call applications and pass data to the application for processing.

2. Basic steps to implement the search function

1. Create a search form and search results page

First, we need to create a search form on the web page , allowing users to enter search keywords. For example, you can add the following code to HTML:

<form action="search.cgi" method="GET">
  <input type="text" name="keyword" placeholder="请输入关键字" />
  <input type="submit" value="搜索" />
</form>

The action attribute here specifies the CGI script to be called when the form is submitted, and the method attribute specifies the The request method is GET. The keywords entered by the user will be passed to the CGI script as request parameters.

At the same time, we also need to create a page for displaying search results. We can use HTML and CSS to beautify the page layout.

2. Writing a CGI script

Next, we need to write a CGI script to process the search request submitted by the user and return the corresponding search results.

Taking PHP as an example, we can create a file named search.cgi and then write script code in the file. The following is the sample code:

<?php
// 获取用户输入的关键字
$keyword = $_GET['keyword'];

// 查询数据库或其他资源，获取与关键字匹配的搜索结果
// 这里只是一个简单示例，我们假设搜索结果是一个数组
$results = ['搜索结果1', '搜索结果2', '搜索结果3'];

// 显示搜索结果
foreach ($results as $result) {
  echo $result . "<br>";
}
?>

3. Run and test

Upload the written search form and CGI script files to the website's server, and ensure that the server supports PHP and CGI. Then, by accessing the web page where the search form is located, you can enter keywords to search and see the corresponding search results.

3. Expansion and Optimization

The above is a simple example of how to implement the search function. In actual applications, we may need to expand and optimize the search function according to actual needs.

1. Database query: Normally, we will store the content we want to search in the database. Using database query statements to obtain search results can improve search efficiency and flexibility.
2. Page display: If there are a lot of search results, you can consider displaying the search results in pages, displaying a certain number of results on each page, and providing page navigation functions for users to browse.
3. Search engine optimization: In order to improve the website's ranking in search engines, you can use some optimization techniques, such as adding keyword tags (meta tags), setting page titles and descriptions appropriately, etc.

Summary:

By using PHP and CGI, we can easily implement the search function of the website. The above sample code is just a simple example and needs to be appropriately expanded and optimized according to specific needs in actual applications. I hope this article can help you with your website development work.

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