check for nKeyLength not arKey

ChangeLog

@@ -2,7 +2,7 @@ PHP 4.0 CHANGE LOG                                                    ChangeLog
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 
 ??? ?? 1999, Version 4.0 Beta 2
-- Fixed a bug that prevented uksort() from working correctly (Andrey)
+- Fixed bugs in uksort() and ksort() sort ordering (Andrey)
 - Fixed a memory leak when using assignment-op operators with lvalue of type
   string.
 - Fixed a problem in inheritence from classes that are defined in include()d

ext/standard/basic_functions.c

@@ -634,11 +634,11 @@ static int array_key_compare(const void *a, const void *b)
 	first = *((Bucket **) a);
 	second = *((Bucket **) b);
 
-	if (first->arKey == NULL && second->arKey == NULL) {
+	if (first->nKeyLength == 0 && second->nKeyLength == 0) {
 		return (first->h - second->h);
-	} else if (first->arKey == NULL) {
+	} else if (first->nKeyLength == 0) {
 		return -1;
-	} else if (second->arKey == NULL) {
+	} else if (second->nKeyLength == 0) {
 		return 1;
 	}
 	min = MIN(first->nKeyLength, second->nKeyLength);