Fixed bug #77909: DatePeriod::__construct() with invalid recurrence count value

Improve error message on invalid reccurence count

Adding test when reccurence is -1

Author: nyamsprod

NEWS

@@ -9,6 +9,10 @@ PHP                                                                        NEWS
   . Fixed bug #77794 (Incorrect Date header format in built-in server).
     (kelunik)
 
+- Date:
+  . Fixed bug #77909 (DatePeriod::__construct() with invalid recurrence count
+    value). (Ignace Nyamagana Butera)
+
 - Interbase:
   . Fixed bug #72175 (Impossibility of creating multiple connections to
     Interbase with php 7.x). (Nikita)

ext/date/php_date.c

@@ -4645,6 +4645,10 @@ PHP_METHOD(DatePeriod, __construct)
 			dpobj->end = clone;
 		}
 	}
+ 
+	if (dpobj->end == NULL && recurrences < 1) {
+		php_error_docref(NULL, E_WARNING, "The recurrence count '%d' is invalid. Needs to be > 0", (int) recurrences);
+	}
 
 	/* options */
 	dpobj->include_start_date = !(options & PHP_DATE_PERIOD_EXCLUDE_START_DATE);

ext/date/tests/DatePeriod_wrong_recurrence_on_constructor.phpt

@@ -0,0 +1,19 @@
+--TEST--
+DatePeriod: Test wrong recurrence parameter on __construct
+--FILE--
+<?php
+try {
+    new DatePeriod(new DateTime('yesterday'), new DateInterval('P1D'), 0);
+} catch (Exception $exception) {
+    echo $exception->getMessage(), "\n";
+}
+
+try {
+    new DatePeriod(new DateTime('yesterday'), new DateInterval('P1D'),-1);
+} catch (Exception $exception) {
+    echo $exception->getMessage(), "\n";
+}
+?>
+--EXPECTF--
+DatePeriod::__construct(): The recurrence count '0' is invalid. Needs to be > 0
+DatePeriod::__construct(): The recurrence count '-1' is invalid. Needs to be > 0