How can the syntax for including PHP variables in email subjects be improved?

When including PHP variables in email subjects, it is important to ensure that the syntax is correct to avoid any errors. One way to improve the syntax is by using double quotes around the variable within the subject line. This will ensure that the variable is properly parsed and its value is included in the subject line of the email.

// Example of improved syntax for including PHP variables in email subjects
$email_subject = "New message from: $sender_name";