fix bug #75222 DateInterval microseconds property always 0

Author: jhdxr

NEWS

@@ -6,6 +6,9 @@ PHP                                                                        NEWS
   . Fixed bug #75220 (Segfault when calling is_callable on parent). 
     (andrewnester)
 
+- Date:
+  . Fixed bug #75222 (DateInterval microseconds property always 0). (jhdxr)
+
 - litespeed:
   . Fixed bug #75248 (Binary directory doesn't get created when building 
     only litespeed SAPI). (petk)

ext/date/php_date.c

@@ -4165,7 +4165,7 @@ zval *date_interval_read_property(zval *object, zval *member, int type, void **c
 		GET_VALUE_FROM_STRUCT(i, "i");
 		GET_VALUE_FROM_STRUCT(s, "s");
 		if (strcmp(Z_STRVAL_P(member), "f") == 0) {
-			fvalue = obj->diff->us / 1000000;
+			fvalue = obj->diff->us / 1000000.0;
 			break;
 		}
 		GET_VALUE_FROM_STRUCT(invert, "invert");

ext/date/tests/bug75222.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Bug #75222 DateInterval microseconds property always 0
+--FILE--
+<?php
+
+$dt1 = new \DateTimeImmutable('2017-01-01T00:00:00.000000Z');
+$dt2 = new \DateTimeImmutable('2017-01-01T00:00:00.123456Z');
+$diff = $dt1->diff($dt2);
+//var_dump($diff);
+var_dump($diff->f);
+var_dump(get_object_vars($diff)['f']);
+var_dump($diff->f === get_object_vars($diff)['f']);
+?>
+--EXPECTF--
+float(0.123456)
+float(0.123456)
+bool(true)