Description:
------------
c-client supports UID EXPUNGE feature from RFC 4315
Following patch adds the functionality to imap_expunge() when UID is set as 
second argument:

diff -ur php-5.3.17.orig/ext/imap/php_imap.c php-5.3.17/ext/imap/php_imap.c
--- php-5.3.17.orig/ext/imap/php_imap.c 2012-10-29 17:49:28.000000000 +0200
+++ php-5.3.17/ext/imap/php_imap.c      2012-12-06 11:11:41.000000000 +0200
@@ -166,7 +166,8 @@
 #endif
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_imap_expunge, 0, 0, 1)
-       ZEND_ARG_INFO(0, stream_id)
+        ZEND_ARG_INFO(0, stream_id)
+        ZEND_ARG_INFO(0, sequence)
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_imap_gc, 0, 0, 1)
@@ -1137,6 +1138,7 @@
 #if HAVE_IMAP_KRB && HAVE_IMAP_AUTH_GSS
        php_info_print_table_row(2, "Kerberos Support", "enabled");
 #endif
+       php_info_print_table_row(2, "IMAP UIDEXPUNGE Support", "enabled");
        php_info_print_table_end();
 }
 /* }}} */
@@ -1553,18 +1555,23 @@
    Permanently delete all messages marked for deletion */
 PHP_FUNCTION(imap_expunge)
 {
-       zval *streamind;
-       pils *imap_le_struct;
+       zval *streamind;
+       char *sequence;
+       long flags = 0x1;
+       int sequence_len;
+       int argc = ZEND_NUM_ARGS();
 
-       if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &streamind) == 
FAILURE) {
-               return;
-       }
+        pils *imap_le_struct;
 
-       ZEND_FETCH_RESOURCE(imap_le_struct, pils *, &streamind, -1, "imap", 
le_imap);
+        if (zend_parse_parameters(argc TSRMLS_CC, "r|s", &streamind, &sequence, 
&sequence_len) == FAILURE) {
+                return;
+        }
 
-       mail_expunge (imap_le_struct->imap_stream);
+        ZEND_FETCH_RESOURCE(imap_le_struct, pils *, &streamind, -1, "imap", 
le_imap);
 
-       RETURN_TRUE;
+        mail_expunge_full (imap_le_struct->imap_stream, (argc == 2 ? sequence : 
NIL), (argc == 2 ? flags : NIL));
+
+        RETURN_TRUE;
 }
 /* }}} */
 

Test script:
---------------
imap_expunge(resource $imap_stream, int $uid)