Test DatePeriod constructor with named arguments

tests/PHPStan/Rules/Classes/InstantiationRuleTest.php

@@ -379,4 +379,47 @@ public function testBug6370(): void
 		]);
 	}
 
+	public function testBug5553(): void
+	{
+		if (PHP_VERSION_ID < 80000) {
+			$this->markTestSkipped('Test requires PHP 8.0.');
+		}
+
+		$this->analyse([__DIR__ . '/data/bug-5553.php'], []);
+	}
+
+	public function testBug7048(): void
+	{
+		if (PHP_VERSION_ID < 80000) {
+			$this->markTestSkipped('Test requires PHP 8.0.');
+		}
+
+		$this->analyse([__DIR__ . '/data/bug-7048.php'], [
+			[
+				'Unknown parameter $recurrences in call to DatePeriod constructor.',
+				21,
+			],
+			[
+				'Missing parameter $end (DateTimeInterface|int) in call to DatePeriod constructor.',
+				18,
+			],
+			[
+				'Unknown parameter $isostr in call to DatePeriod constructor.',
+				25,
+			],
+			[
+				'Missing parameter $start (string) in call to DatePeriod constructor.',
+				24,
+			],
+			[
+				'Parameter #3 $end of class DatePeriod constructor expects DateTimeInterface|int, string given.',
+				41,
+			],
+			[
+				'Parameter $end of class DatePeriod constructor expects DateTimeInterface|int, string given.',
+				49,
+			],
+		]);
+	}
+
 }

tests/PHPStan/Rules/Classes/data/bug-5553.php

@@ -0,0 +1,29 @@
+<?php // lint >= 8.0
+
+namespace Bug5553;
+
+use DatePeriod;
+use DateTime;
+
+class Foo
+{
+
+	public function weekNumberToWorkRange(int $week, int $year): DatePeriod
+	{
+		$dto = new DateTime();
+		$dto->setISODate($year, $week);
+		$dto->setTime(8, 0, 0, 0);
+
+		$start = clone $dto;
+		$dto->modify('+4 days');
+		$end = clone $dto;
+		$end->setTime(18, 0, 0, 0);
+
+		return new DatePeriod(
+			start: $start,
+			interval: new \DateInterval('P1D'),
+			end: $end
+		);
+	}
+
+}

tests/PHPStan/Rules/Classes/data/bug-7048.php

@@ -0,0 +1,52 @@
+<?php declare(strict_types = 1); // lint >= 8.0
+
+namespace Bug7048;
+
+class HelloWorld
+{
+	public function sayHello(): \DatePeriod
+	{
+		return new \DatePeriod(
+			start: new \DateTime('now'),
+			interval: new \DateInterval('P1D'),
+			end: new \DateTime('now + 3 days'),
+		);
+	}
+
+	public function doFoo(): void
+	{
+		new \DatePeriod(
+			start: new \DateTime('now'),
+			interval: new \DateInterval('P1D'),
+			recurrences: 5,
+		);
+
+		new \DatePeriod(
+			isostr: 'R4/2012-07-01T00:00:00Z/P7D'
+		);
+	}
+
+	public function allValid(): void
+	{
+		$start = new \DateTime('2012-07-01');
+		$interval = new \DateInterval('P7D');
+		$end = new \DateTime('2012-07-31');
+		$recurrences = 4;
+		$iso = 'R4/2012-07-01T00:00:00Z/P7D';
+
+
+		$period = new \DatePeriod($start, $interval, $recurrences);
+		$period = new \DatePeriod($start, $interval, $end);
+		$period = new \DatePeriod($iso);
+		$period = new \DatePeriod($start, $interval, "foo");
+	}
+
+	public function invalid(): void
+	{
+		new \DatePeriod(
+			start: new \DateTime('now'),
+			interval: new \DateInterval('P1D'),
+			end: "foo",
+		);
+	}
+}