How can the issue of equal signs appearing in emails sent through PHP be resolved?

The issue of equal signs appearing in emails sent through PHP can be resolved by properly encoding the email content using base64 encoding. This ensures that special characters, including equal signs, are properly handled and do not interfere with the email's structure.

// Set the email content
$email_content = "This is a test email with equal signs =";

// Encode the email content using base64
$encoded_content = chunk_split(base64_encode($email_content));

// Set the email headers
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/plain; charset=utf-8\r\n";
$headers .= "Content-Transfer-Encoding: base64\r\n";

// Send the email
mail('recipient@example.com', 'Subject', $encoded_content, $headers);