How to convert download links in HTML into PHP scripts

With the continuous development of Internet technology, the implementation of various web design and functions are also constantly updated and improved. Among them, the HTML file jump function of PHP download file is a very practical technology. This article will introduce the implementation principle and operation steps of this technology in detail.

1. Implementation Principle

First of all, we need to clarify two concepts: HTML and PHP. HTML is a markup language, used to describe the structure and content of web pages, and can achieve conventional web page layout and display effects; while PHP is a powerful scripting language, suitable for web development, and can realize dynamic interactive functions of web pages. The implementation principle of jumping HTML files to PHP download files is to convert the download link in HTML into a PHP script. The specific steps are as follows:

1. Add a download link in HTML

First, add a download link in the HTML file, for example:

Click to download the PDF file

Among them, download.php is the PHP script we are going to create, file is the parameter that the script needs to receive, and example.pdf is the name of the file to be downloaded.

2. Create a PHP script

Next, we need to create a PHP script named download.php to receive parameters and implement the file download function. The specific code is as follows:

$file = $_GET['file']; //Get parameter value
$path = "/path/to/your/files/" ; //File path
$fullPath = $path . $file; //Full path of spliced ​​files
if (!file_exists($fullPath)) { //Determine whether the file exists

die("文件不存在！");

}
header("Content-type: application/octet-stream"); ​​//Set the MIME type of the downloaded file
header("Content-Disposition: attachment; filename=" . $file); //Set the download File name of the file
readfile($fullPath); //Output file content
?>

This code mainly implements the following functions:

• Get parameter value: Use $_GET['file'] to get the file parameter value passed in HTML.
• Determine whether the file exists: Use the file_exists() function to determine whether the file exists. If it does not exist, the prompt message "The file does not exist" will be output.
• Set the MIME type and file name of the downloaded file: use the header() function to set the HTTP response header, set Content-type to application/octet-stream, indicating that the downloaded file is a binary file; Content-Disposition is attachment, Indicates downloading as an attachment; filename is the file name and is assigned using the $file variable.
• Output file content: Use the readfile() function to read the file content and output it to the browser to implement the file download function.

At this point, the implementation principle of jumping from HTML files to PHP download files has been introduced. Next, we will introduce the specific operation steps.

2. Operation steps

1. Create a download link

First, create a download link in the HTML file, for example:

Click to download PDF file

The file name is example.pdf. If you need to download other files, you need to change the value of the file parameter.

2. Create a PHP script

Next, we need to create a PHP script of download.php to implement the file download function based on the above code.

3. Upload the file to the server

Upload the file to be downloaded to the server, and set the file path to the PHP script, such as:

$path = "/ path/to/your/files/"; //File path

Make sure the file path and file name are correct.

4. Test file download

Open the HTML file in the browser and click the download link to realize the file download function. If the download fails, you need to check whether the PHP script and uploaded files are configured and stored correctly.

3. Summary

HTML file jump to PHP download file is a practical technology that can make the website more powerful and convenient. Through the introduction of this article, we understand the implementation principle and operation steps of this technology, and hope to be helpful to readers.

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