How can the error "IMAP protocol error: [CLIENTBUG] Command not allowed during EXAMINE" be resolved when using PHP?

To resolve the error "IMAP protocol error: [CLIENTBUG] Command not allowed during EXAMINE" when using PHP, you can switch the command from EXAMINE to SELECT when interacting with the IMAP server. The EXAMINE command is restricted in some IMAP servers, so using SELECT instead can help avoid this error. 

$mailbox = '{imap.example.com:993/imap/ssl}INBOX';
$username = 'your_username';
$password = 'your_password';

$inbox = imap_open($mailbox, $username, $password) or die('Cannot connect to mailbox: ' . imap_last_error());

// Use SELECT instead of EXAMINE to avoid the error
$emails = imap_search($inbox, 'ALL');

foreach ($emails as $email_number) {
    $overview = imap_fetch_overview($inbox, $email_number, 0);
    echo "Subject: " . $overview[0]->subject . "<br>";
}

imap_close($inbox);

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