How can the issue of empty variables when sending emails through PHP be resolved?

When sending emails through PHP, the issue of empty variables can be resolved by checking if the variables are empty before using them in the email content. This can be done using conditional statements to ensure that only non-empty variables are included in the email.

// Check if variables are empty before using them in the email content
if (!empty($variable1) && !empty($variable2)) {
    $to = 'recipient@example.com';
    $subject = 'Subject of the email';
    $message = 'Variable 1: ' . $variable1 . ' | Variable 2: ' . $variable2;
    
    // Send email
    mail($to, $subject, $message);
} else {
    echo 'One or more variables are empty. Email not sent.';
}