Search IMAP Mailbox for Email Matching Criteria

put_Ssl(true);
$imap->put_Port(993);
$success = $imap->Connect('imap.someMailServer.com');
if ($success != true) {
    print $imap->lastErrorText() . "\n";
    exit;
}

// Login
$success = $imap->Login('myLogin','myPassword');
if ($success != true) {
    print $imap->lastErrorText() . "\n";
    exit;
}

// Select an IMAP mailbox
$success = $imap->SelectMailbox('Inbox');
if ($success != true) {
    print $imap->lastErrorText() . "\n";
    exit;
}

// We can choose to fetch UIDs or sequence numbers.
$fetchUids = true;

// Here are examples of different search criteria:

// Return all messages.
$allMsgs = 'ALL';

// Search for already-answered emails.
$answered = 'ANSWERED';

// Search for messages on a specific date.
// The date string is DD-Month-YYYY where Month is
// Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, or Dec.
$onDate = 'SENTON 05-Mar-2007';

// Search for messages between two dates.  SENTBEFORE
// finds emails sent before a date, and SENTSINCE finds
// email sent on or after a date.  The "AND" operation
// is implied by joining criteria, separated by spaces.
$betweenDates = 'SENTSINCE 01-Mar-2007 SENTBEFORE 05-Mar-2007';

// Another example of AND: find all unanswered emails
// sent after 04-Mar-2007 with "Problem" in the subject:
$complexSearch1 = 'UNANSWERED SENTSINCE 04-Mar-2007 Subject \'Problem\'';

// Find messages with a specific string in the body:
$bodySearch = 'BODY \'problem solved\'';

// Using OR.  The syntax is OR  . 
// The "OR" comes first, followed by each criteria.
// For example, to match all emails with "Help" or "Question" in the subject.
// You'll notice that literal strings may be quoted or unquoted.
// If a literal contains SPACE characters, quote it:
$orSearch = 'OR SUBJECT Help SUBJECT Question';

// ----------------------------------------------
// Strings are case-insensitive when searching....
// ----------------------------------------------

// Find all emails sent from yahoo.com addresses:
$fromSearch = 'FROM yahoo.com';
// Find all emails sent from anyone with "John" in their name:
$johnSearch = 'FROM John';

// Find emails with the RECENT flag set:
$recentSearch = 'RECENT';

// Find emails that don't have the recent flag set:
$notRecentSearch = 'NOT RECENT';
// This is synonymous with "OLD":
$oldSearch = 'OLD';

// Find all emails marked for deletion:
$markedForDeleteSearch = 'DELETED';

// Find all emails having a specified header field with a value
// containing a substring:
$headerSearch = 'HEADER DomainKey-Signature paypal.com';

// Find any emails having a specific header field.  If the 
// 2nd argument to the "HEADER" criteria is an empty string,
// any email having the header field is returned regardless
// of the header field's content.
// Find any emails with a DomainKey-Signature field:
$headerExistsSearch = 'HEADER DomainKey-Signature \'\'';

// Find NEW emails: these are emails that have the RECENT flag
// set, but not the SEEN flag:
$newSearch = 'NEW';

// Find emails larger than a certain number of bytes:
$sizeLargerSearch = 'LARGER 500000';

// Find emails marked as seen or not already seen:
$seenSearch = 'SEEN';
$notSeenSearch = 'NOT SEEN';

// Find emails having a given substring in the TO header field:
$toSearch = 'TO [email protected]';
// A more long-winded way to do the same thing:
$toSearch2 = 'HEADER TO [email protected]';

// Find emails smaller than a size in bytes:
$smallerSearch = 'SMALLER 30000';

// Find emails that have a substring anywhere in the header
// or body:
$fullSubstringSearch = 'TEXT \'Zip Component\'';

// Pass any of the above strings here to test a search:
// messageSet is a [CkMessageSet](http://www.chilkatsoft.com/refdoc/phpCkMessageSetRef.html)
$messageSet = $imap->Search($orSearch,$fetchUids);
if ($imap->get_LastMethodSuccess() == false) {
    print $imap->lastErrorText() . "\n";
    exit;
}

// Fetch the email headers into a bundle object:

// bundle is a [CkEmailBundle](http://www.chilkatsoft.com/refdoc/phpCkEmailBundleRef.html)
$bundle = $imap->FetchHeaders($messageSet);
if ($imap->get_LastMethodSuccess() == false) {

    print $imap->lastErrorText() . "\n";
    exit;
}

// Display the Subject and From of each email.
$i = 0;
while ($i < $bundle->get_MessageCount()) {

    // email is a [CkEmail](http://www.chilkatsoft.com/refdoc/phpCkEmailRef.html)
    $email = $bundle->GetEmail($i);

    print $email->getHeaderField('Date') . "\n";
    print $email->subject() . "\n";
    print $email->from() . "\n";
    print '--' . "\n";

    $i = $i + 1;
}

// Disconnect from the IMAP server.
$success = $imap->Disconnect();

?>

参考：https://www.example-code.com/phpExt/imap_search.asp