Description:
------------
I get an unexpected warning msg when I specify an haystack with a non-zero offset. 


I think the problem lies in the following code in ext/standard/string.c  

2913  if (haystack_type == IS_UNICODE) {
2914   	if (offset >= 0) {
2915 	   U16_FWD_N(haystack.u, cu_offset, haystack_len, offset);
2916 	   if (cu_offset > haystack_len - needle_len) {
2917 	   php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Offset is greater than the length of haystack string");
2918  	   RETURN_FALSE;
2919 	}
2920 	u_p = haystack.u + cu_offset;
2921 	u_e = haystack.u + haystack_len - needle_len;
2922  } else { 

If (cu_offset > haystack_len - needle_len) then FALSE should be returned but the warning is bogus; that should only be output if cu_offset > haystack_len.

Reproduce code:
---------------
<?php

$haystack = "abcdefg";
$needle = "abcdefg";
var_dump( strripos($haystack, $needle, 0) );
var_dump( strripos($haystack, $needle, 1) );

?>

Expected result:
----------------
int(0)
bool(false)

Actual result:
--------------
int(0)
bool(false)
PHP Notice:  strripos(): Offset is greater than the length of haystack string in .... etc