What are the implications of using different charsets, such as iso-8859-1 or UTF-8, when encoding special characters in email headers using PHP?

When encoding special characters in email headers using PHP, it is important to use the correct charset to ensure proper display across different email clients. Using UTF-8 is recommended as it supports a wider range of characters compared to iso-8859-1. To ensure proper encoding, you can use PHP's mb_encode_mimeheader function with the UTF-8 charset. 

// Set the subject with special characters
$subject = "Subject with special characters é";

// Encode the subject using UTF-8 charset
$encoded_subject = mb_encode_mimeheader($subject, "UTF-8");

// Set the email headers
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=UTF-8\r\n";
$headers .= "From: sender@example.com\r\n";
$headers .= "Subject: " . $encoded_subject . "\r\n";

// Send the email
mail("recipient@example.com", $encoded_subject, "Email body", $headers);

Keywords

charsets iso-8859-1 UTF-8 encoding email headers

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