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The imap_header() function in PHP is used to fetch the header for a specific message in an IMAP mailbox. The function returns an associative array with information such as the subject, sender, recipient, date, and other header fields of the email.

Here's an example of how you can use the imap_header() function:

php
// Open the IMAP connection
$mailbox = imap_open("{your-mail-server.com:993/imap/ssl}", "your-email@example.com", "your-password");

// Search for messages in the INBOX
$searchResult = imap_search($mailbox, 'ALL');

// Fetch the header for the first message
$header = imap_header($mailbox, $searchResult[0]);

// Example: Print the subject of the email
echo "Subject: " . $header->subject . "<br>";

// Close the IMAP connection
imap_close($mailbox);


In this example, the imap_header() function is used to fetch the header information for the first message in the INBOX folder. The subject of the email is then printed using the $header->subject property.

Remember to replace {your-mail-server.com:993/imap/ssl}, your-email@example.com, and your-password with the appropriate values for your email server configuration.

You can also use other properties of the $header object, such as $header->from, $header->to, $header->date, etc., to access different header fields of the email.