Fix BC introduced in #19188 (#19194)

framework/filters/PageCache.php

@@ -295,7 +295,7 @@ class PageCache extends ActionFilter implements DynamicContentAwareInterface
             return;
         }
 
-        $all = $response->headers->toArray(true);
+        $all = $response->headers->toOriginalArray();
         if (is_array($this->cacheHeaders)) {
             $filtered = [];
             foreach ($this->cacheHeaders as $name) {

framework/web/HeaderCollection.php

@@ -177,15 +177,20 @@ class HeaderCollection extends BaseObject implements \IteratorAggregate, \ArrayA
      * Returns the collection as a PHP array.
      * @return array the array representation of the collection.
      * The array keys are header names, and the array values are the corresponding header values.
-     * Since 2.0.45 you can pass true here to get the headers list of original header names (case-sensitive) instead of
-     * default normalized (case-insensitive) ones.
      */
-    public function toArray($originalNames = false)
+    public function toArray()
     {
-        if ($originalNames === false) {
-            return $this->_headers;
-        }
+        return $this->_headers;
+    }
 
+    /**
+     * Returns the collection as a PHP array but instead of using normalized header names as keys (like [[toArray()]])
+     * it uses original header names (case-sensitive).
+     * @return array the array representation of the collection.
+     * @since 2.0.45
+     */
+    public function toOriginalArray()
+    {
         return \array_map(function ($normalizedName) {
             return $this->_headers[$normalizedName];
         }, \array_flip($this->_originalHeaderNames));

tests/framework/filters/PageCacheTest.php

@@ -243,7 +243,7 @@ class PageCacheTest extends TestCase
         }
         // Headers
         if (isset($testCase['headers'])) {
-            $headersExpected = Yii::$app->response->headers->toArray(true);
+            $headersExpected = Yii::$app->response->headers->toOriginalArray();
             foreach ($testCase['headers'] as $name => $expected) {
                 $this->assertSame($expected, Yii::$app->response->headers->has($name), $testCase['name']);
                 if ($expected) {

tests/framework/web/HeaderCollectionTest.php

@@ -43,14 +43,14 @@ class HeaderCollectionTest extends TestCase
         $this->assertSame('1', $headerCollection->get('x-hEadER'));
         $this->assertSame(['1'], $headerCollection->get('x-hEadER', null, false));
         $this->assertSame(['x-header' => ['1']], $headerCollection->toArray());
-        $this->assertSame(['X-Header' => ['1']], $headerCollection->toArray(true));
+        $this->assertSame(['X-Header' => ['1']], $headerCollection->toOriginalArray());
 
         $headerCollection->set('X-HEADER', '2');
         $this->assertSame('2', $headerCollection->get('X-Header'));
         $this->assertSame('2', $headerCollection->get('x-header'));
         $this->assertSame('2', $headerCollection->get('x-hEadER'));
         $this->assertSame(['x-header' => ['2']], $headerCollection->toArray());
-        $this->assertSame(['X-HEADER' => ['2']], $headerCollection->toArray(true));
+        $this->assertSame(['X-HEADER' => ['2']], $headerCollection->toOriginalArray());
 
         $headerCollection->offsetSet('X-HEADER', '3');
         $this->assertSame('3', $headerCollection->get('X-Header'));
@@ -77,7 +77,7 @@ class HeaderCollectionTest extends TestCase
         $this->assertSame('1', $headerCollection->get('x-hEadER'));
         $this->assertSame(['1'], $headerCollection->get('x-hEadER', null, false));
         $this->assertSame(['x-header' => ['1']], $headerCollection->toArray());
-        $this->assertSame(['X-Header' => ['1']], $headerCollection->toArray(true));
+        $this->assertSame(['X-Header' => ['1']], $headerCollection->toOriginalArray());
 
         $headerCollection->add('X-HEADER', '2');
         $this->assertSame('1', $headerCollection->get('X-Header'));
@@ -85,7 +85,7 @@ class HeaderCollectionTest extends TestCase
         $this->assertSame('1', $headerCollection->get('x-hEadER'));
         $this->assertSame(['1', '2'], $headerCollection->get('x-header', null, false));
         $this->assertSame(['x-header' => ['1', '2']], $headerCollection->toArray());
-        $this->assertSame(['X-Header' => ['1', '2']], $headerCollection->toArray(true));
+        $this->assertSame(['X-Header' => ['1', '2']], $headerCollection->toOriginalArray());
     }
 
     public function testRemover()