replace pow with expression

Author: ThomasMeschke

system/Files/File.php

@@ -222,7 +222,7 @@ public function getDestination(string $destination, string $delimiter = '_', int
     protected function getSizeByUnitInternal(int $fileSizeBase, FileSizeUnit $unit, int $precision)
     {
         $exponent = $unit->value;
-        $divider = pow($fileSizeBase, $exponent);
+        $divider = $fileSizeBase ** $exponent;
 
         $size = $this->getSize() / $divider;
 

tests/system/Files/FileTest.php

@@ -118,7 +118,7 @@ public function testGetSizeReturnsBytes(): void
      */
     public function testGetSizeBinary(FileSizeUnit $unit): void
     {
-        $divider = pow(1024, $unit->value);
+        $divider = 1024 ** $unit->value;
         $file = new File(SYSTEMPATH . 'Common.php');
         $size = number_format(filesize(SYSTEMPATH . 'Common.php') / $divider, 3);
         $this->assertSame($size, $file->getSizeByUnitBinary($unit));
@@ -136,7 +136,7 @@ public function testGetSizeBinaryBytes(): void
      */
     public function testGetSizeMetric(FileSizeUnit $unit): void
     {
-        $divider = pow(1000, $unit->value);
+        $divider = 1000 ** $unit->value;
         $file = new File(SYSTEMPATH . 'Common.php');
         $size = number_format(filesize(SYSTEMPATH . 'Common.php') / $divider, 3);
         $this->assertSame($size, $file->getSizeByUnitMetric($unit));