What are the compatibility issues with different PHP versions when sending HTML emails?

When sending HTML emails with PHP, compatibility issues can arise when using different PHP versions. To ensure compatibility, it's important to use PHP functions that are supported across various versions. One common issue is the use of the `mail()` function, which may behave differently in older PHP versions. To solve this, it's recommended to use a library like PHPMailer, which provides a more consistent and reliable way to send HTML emails across different PHP versions. 

// Example using PHPMailer to send HTML email
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    $mail->isHTML(true);
    $mail->Subject = 'Subject';
    $mail->Body = '<h1>Hello, this is a test email!</h1>';

    $mail->send();
    echo 'Email sent successfully';
} catch (Exception $e) {
    echo 'Email could not be sent. Mailer Error: ' . $mail->ErrorInfo;
}

Keywords

PHP versions HTML emails compatibility email headers MIME types

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