What are some common troubleshooting steps for identifying and resolving unexpected characters, like exclamation marks, in PHP-generated emails?

Unexpected characters like exclamation marks in PHP-generated emails can be caused by encoding issues. To resolve this, you can use the PHP `mb_encode_mimeheader` function to properly encode the email subject before sending it. 

// Encode the email subject using mb_encode_mimeheader
$subject = 'Subject with exclamation mark!';
$encoded_subject = mb_encode_mimeheader($subject, 'UTF-8');

// Send the email with the properly encoded subject
$headers = 'From: sender@example.com' . "\r\n" .
           'MIME-Version: 1.0' . "\r\n" .
           'Content-type: text/html; charset=UTF-8' . "\r\n";

mail('recipient@example.com', $encoded_subject, 'Email body content', $headers);

Keywords

PHP unexpected characters email troubleshooting encoding

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