Are there any best practices for formatting variables and line breaks in PHP email messages to ensure readability?

When sending email messages in PHP, it is important to format variables and line breaks properly to ensure readability for the recipient. To achieve this, you can use PHP's concatenation operator (.) to insert variables into the message body and use the PHP_EOL constant to add line breaks. This will make the email content more organized and easier to read for the recipient.

$email = "recipient@example.com";
$subject = "Hello from PHP!";
$message = "Dear recipient," . PHP_EOL . PHP_EOL .
           "This is a message sent from PHP. Here is some information: " . PHP_EOL .
           "Variable 1: " . $variable1 . PHP_EOL .
           "Variable 2: " . $variable2 . PHP_EOL .
           "Thank you for reading!";
$headers = "From: sender@example.com";

// Send the email
mail($email, $subject, $message, $headers);