How can the issue of HTML code displaying in the email content be resolved when using the mail() function in PHP?

When using the mail() function in PHP to send emails with HTML content, the issue of HTML code displaying in the email content can be resolved by setting the appropriate headers in the mail() function call. Specifically, you need to set the Content-Type header to indicate that the email content is in HTML format. 

$to = "recipient@example.com";
$subject = "HTML Email Test";
$message = "<html><body><h1>Hello, this is a test email!</h1></body></html>";
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers .= 'From: sender@example.com' . "\r\n";

mail($to, $subject, $message, $headers);

Keywords

HTML code email content mail() function PHP escaping characters

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