Use match() instead of switch/case.

src/FormattingTrait.php

@@ -250,7 +250,7 @@ public function toQuarter(bool $range = false): int|array
 
         trigger_error(
             'Using toQuarter() with `$range=true` is deprecated. Use `toQuarterRange()` instead.',
-            E_USER_DEPRECATED
+            E_USER_DEPRECATED,
         );
 
         return $this->toQuarterRange();
@@ -259,23 +259,20 @@ public function toQuarter(bool $range = false): int|array
     /**
      * Returns the quarter range
      *
-     * @return array<string> Array with start and end date of quarter in Y-m-d format
+     * @return array{0: string, 1: string} Array with start and end date of quarter in Y-m-d format
      */
     public function toQuarterRange(): array
     {
+        /** @var int<1, 4> $quarter */
         $quarter = (int)ceil((int)$this->format('m') / 3);
         $year = $this->format('Y');
 
-        switch ($quarter) {
-            case 1:
-                return [$year . '-01-01', $year . '-03-31'];
-            case 2:
-                return [$year . '-04-01', $year . '-06-30'];
-            case 3:
-                return [$year . '-07-01', $year . '-09-30'];
-            default:
-                return [$year . '-10-01', $year . '-12-31'];
-        }
+        return match ($quarter) {
+            1 => [$year . '-01-01', $year . '-03-31'],
+            2 => [$year . '-04-01', $year . '-06-30'],
+            3 => [$year . '-07-01', $year . '-09-30'],
+            4 => [$year . '-10-01', $year . '-12-31'],
+        };
     }
 
     /**

tests/TestCase/DateTime/StringsTest.php

@@ -205,7 +205,7 @@ public static function toQuarterRangeProvider()
     public function testToQuarterRange($date, $expected)
     {
         $this->assertSame($expected, (new Chronos($date))->toQuarterRange());
-        $this->deprecated(function() use ($date, $expected) {
+        $this->deprecated(function () use ($date, $expected) {
             $this->assertSame($expected, (new Chronos($date))->toQuarter(true));
         });
     }