HTML output minification is important to improve website performance by reducing the page load times and reduce the overall page size. Minifying HTML output also reduces the data usage of the user requesting the site.
Minification can be done by removing unnecessary details and eliminating excessive whitespaces, newlines, comments, etc. However, minification reduces the readability of the code. Minification can reduce file size upto 70%. PHP is used to transfer files from development to production environment. HTML files can be minified both manually and automatically. Minification can be undone using several tools that add whitespaces in the code. However, any comments removed during minification cannot be restored.
Example: This is the HTML file without minifying the the code.
HTML file after minification
<html><head><title>Title Page</title></head><body><h1>Hello world!</h1></body></html>
Approach 1: Using GZip Compression in Apache:
Steps to enable Gzip Compression in Apache
- Open the Apache configuration file
- Check the following line in the configuration file.
LoadModule deflate_module modules/mod_deflate.so
- Add the following lines at the end of configuration file.
- Restart the Apache Server
sudo service httpd restart
Approach 2: HTML code can be minified with ob_start() function with a callback.
<!DOCTYPE html><html><head><title>Demo for minifier</title></head><body><h1>Hello World</h1></body></html>
Steps to use HTMLMinifier:
- Download the HTMLMinifier file from https://www.terresquall.com/download/HTMLMinifier.php
- Include the following code into the php file
// Import the HTMLMinifier
// HTML source to be minified
// Minified version of the page
- Run the php file