How to use PHP and CGI to implement the file search and filtering functions of the website

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

When developing a website, sometimes we need to provide users with a file search and filtering function so that users can quickly find them Required documents. This is a very common function in many websites, such as product search on e-commerce websites, song search on music websites, etc. This article will introduce how to use PHP and CGI to implement a simple file search and filtering function.

First of all, we need to clarify the function to be implemented. Users need to enter a keyword to search, and the system will search for files based on the keyword and display the files that meet the conditions on the page. In addition, users can also filter search results according to specific conditions, such as file type, file size, file creation date, etc.

First, we need to create a search form to facilitate users to enter keywords. We can use the HTML form tag to create this form, as shown below:

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

After the user submits the form, the form data will be sent to the search.php PHP file for processing. In search.php, we need to get the keywords entered by the user and perform a file search.

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

// 执行文件搜索
$files = glob("*.*");

// 过滤文件，只保留符合条件的文件
$filteredFiles = array_filter($files, function ($file) use ($keyword) {
    if (stripos($file, $keyword) !== false) {
        return true;
    }
    return false;
});

// 输出搜索结果
foreach ($filteredFiles as $file) {
    echo '<a href="' . $file . '">' . $file . '</a><br />';
}
?>

In the above code, we use the glob function to get the list of all files. Then, we used the array_filter function to filter the files and only retain files that meet the conditions. In this example, we use the stripos function to determine whether the file name contains the search keyword, and returns true if it does, otherwise it returns false.

Next, we need to provide filtering capabilities for users. We can use the HTML select tag to create a drop-down menu, and users can select different filter conditions, as shown below:

<form action="search.php" method="get">
  <input type="text" name="keyword" placeholder="请输入关键字" />
  <select name="filter">
    <option value="all">所有文件类型</option>
    <option value="txt">文本文件</option>
    <option value="jpg">图片文件</option>
    <option value="mp3">音频文件</option>
  </select>
  <input type="submit" value="搜索" />
</form>

In search.php, we need to get the filter conditions selected by the user and based on the conditions to filter files.

<?php
$keyword = $_GET['keyword'];
$filter = $_GET['filter'];

$files = glob("*.$filter");

$filteredFiles = array_filter($files, function ($file) use ($keyword) {
    if (stripos($file, $keyword) !== false) {
        return true;
    }
    return false;
});

foreach ($filteredFiles as $file) {
    echo '<a href="' . $file . '">' . $file . '</a><br />';
}
?>

In the above code, we use the wildcard function of the glob function to specify that only specific types of files are searched. Based on the filter criteria selected by the user, we replace the file type part in the wildcard with the value of the $filter variable.

Through the above code example, we have implemented a simple file search and filtering function. Users can enter keywords to search and filter based on file type. The system will then return a list of eligible files for the user to view.

It should be noted that the above code example is just a simple implementation. In actual projects, some modifications and optimizations may be required based on specific needs. For example, you can add paging functionality to avoid slow page loading due to too many search results. In addition, a sorting function can be added to allow users to sort search results according to specific criteria.

To summarize, it is not complicated to use PHP and CGI to implement the file search and filtering functions of the website. The key is to get the keywords entered by the user and perform file search and filtering based on the keywords. Through this simple feature, we can provide a better user experience and allow users to quickly find the files they need.

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