Are there any specific PHP functions or headers that should be used when sending HTML emails to avoid them being displayed as source code?

When sending HTML emails using PHP, it's important to set the content type header to "text/html" to ensure that the email is interpreted as HTML content by email clients and not displayed as source code. Additionally, using PHP's built-in mail function to send the email with the proper headers will help prevent the email from being displayed incorrectly. 

// Set the content type header to ensure the email is interpreted as HTML
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";

// Send the email using PHP's mail function with the proper headers
mail($to, $subject, $message, $headers);

Keywords

PHP functions headers HTML emails source code.

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