What steps can be taken to troubleshoot and debug PHP code that is not displaying correctly in email clients like Outlook?

When PHP code is not displaying correctly in email clients like Outlook, it may be due to issues with HTML formatting or compatibility. To troubleshoot and debug this issue, ensure that the HTML code is correctly formatted, use inline CSS styles, and test the email in different email clients to identify specific compatibility issues. 

// Example PHP code snippet with correct HTML formatting and inline CSS styles for displaying correctly in email clients like Outlook
$to = 'recipient@example.com';
$subject = 'Test Email';
$message = '
<html>
<head>
<style>
  body {
    font-family: Arial, sans-serif;
  }
  h1 {
    color: #333333;
  }
</style>
</head>
<body>
<h1>This is a test email</h1>
<p>Hello, this is a test email sent from PHP.</p>
</body>
</html>
';

$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

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

Keywords

PHP debugging email clients Outlook troubleshooting

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