How can file_get_contents() be used effectively to read HTML files for email content in PHP?

When reading HTML files for email content in PHP, file_get_contents() can be used effectively by providing the file path as the parameter to retrieve the content of the HTML file. This function will read the entire file into a string, allowing you to easily manipulate and use the HTML content for email templates or messages.

// Read HTML file for email content using file_get_contents()
$html_content = file_get_contents('path/to/email_template.html');

// Use the $html_content variable for email content
echo $html_content;