Are there any best practices for concatenating strings in PHP for email bodies?

When concatenating strings in PHP for email bodies, it is best practice to use double quotes for better readability and easier interpolation of variables. This allows you to easily insert variables into the string using curly braces. Additionally, you can break up long strings into multiple lines for better readability.

$email_body = "Hello {$recipient_name},\n\n";
$email_body .= "Thank you for your inquiry. Here is the information you requested:\n\n";
$email_body .= "Product: {$product_name}\n";
$email_body .= "Price: {$product_price}\n\n";
$email_body .= "Please let us know if you have any further questions.\n\n";
$email_body .= "Best regards,\nYour Company Name";