diff --git a/UPGRADE-6.4.md b/UPGRADE-6.4.md
index ddfc9883a5ac..280d06a073b5 100644
--- a/UPGRADE-6.4.md
+++ b/UPGRADE-6.4.md
@@ -107,6 +107,7 @@ HttpKernel
 
  * [BC break] `BundleInterface` no longer extends `ContainerAwareInterface`
  * [BC break] Add native return types to `TraceableEventDispatcher` and to `MergeExtensionConfigurationPass`
+ * Deprecate `Kernel::stripComments()`
 
 Messenger
 ---------
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index 92949d55f1f0..8a5b4b1467a5 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -44,7 +44,6 @@
 use Symfony\Component\DependencyInjection\Variable;
 use Symfony\Component\ErrorHandler\DebugClassLoader;
 use Symfony\Component\ExpressionLanguage\Expression;
-use Symfony\Component\HttpKernel\Kernel;
 
 /**
  * PhpDumper dumps a service container as a PHP class.
@@ -571,7 +570,7 @@ private function generateProxyClasses(): array
         $proxyClasses = [];
         $alreadyGenerated = [];
         $definitions = $this->container->getDefinitions();
-        $strip = '' === $this->docStar && method_exists(Kernel::class, 'stripComments');
+        $strip = '' === $this->docStar;
         $proxyDumper = $this->getProxyDumper();
         ksort($definitions);
         foreach ($definitions as $id => $definition) {
@@ -620,7 +619,7 @@ private function generateProxyClasses(): array
 
             if ($strip) {
                 $proxyCode = "<?php\n".$proxyCode;
-                $proxyCode = substr(Kernel::stripComments($proxyCode), 5);
+                $proxyCode = substr(self::stripComments($proxyCode), 5);
             }
 
             $proxyClass = explode(' ', $this->inlineRequires ? substr($proxyCode, \strlen($code)) : $proxyCode, 3)[1];
@@ -2339,4 +2338,65 @@ private function isProxyCandidate(Definition $definition, ?bool &$asGhostObject,
 
         return $this->getProxyDumper()->isProxyCandidate($definition, $asGhostObject, $id) ? $definition : null;
     }
+
+    /**
+     * Removes comments from a PHP source string.
+     *
+     * We don't use the PHP php_strip_whitespace() function
+     * as we want the content to be readable and well-formatted.
+     */
+    private static function stripComments(string $source): string
+    {
+        if (!\function_exists('token_get_all')) {
+            return $source;
+        }
+
+        $rawChunk = '';
+        $output = '';
+        $tokens = token_get_all($source);
+        $ignoreSpace = false;
+        for ($i = 0; isset($tokens[$i]); ++$i) {
+            $token = $tokens[$i];
+            if (!isset($token[1]) || 'b"' === $token) {
+                $rawChunk .= $token;
+            } elseif (\T_START_HEREDOC === $token[0]) {
+                $output .= $rawChunk.$token[1];
+                do {
+                    $token = $tokens[++$i];
+                    $output .= isset($token[1]) && 'b"' !== $token ? $token[1] : $token;
+                } while (\T_END_HEREDOC !== $token[0]);
+                $rawChunk = '';
+            } elseif (\T_WHITESPACE === $token[0]) {
+                if ($ignoreSpace) {
+                    $ignoreSpace = false;
+
+                    continue;
+                }
+
+                // replace multiple new lines with a single newline
+                $rawChunk .= preg_replace(['/\n{2,}/S'], "\n", $token[1]);
+            } elseif (\in_array($token[0], [\T_COMMENT, \T_DOC_COMMENT])) {
+                if (!\in_array($rawChunk[\strlen($rawChunk) - 1], [' ', "\n", "\r", "\t"], true)) {
+                    $rawChunk .= ' ';
+                }
+                $ignoreSpace = true;
+            } else {
+                $rawChunk .= $token[1];
+
+                // The PHP-open tag already has a new-line
+                if (\T_OPEN_TAG === $token[0]) {
+                    $ignoreSpace = true;
+                } else {
+                    $ignoreSpace = false;
+                }
+            }
+        }
+
+        $output .= $rawChunk;
+
+        unset($tokens, $rawChunk);
+        gc_mem_caches();
+
+        return $output;
+    }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
index 55a4d231a862..2d0a8aad0ce1 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
@@ -1976,6 +1976,110 @@ public function testCallableAdapterConsumer()
         $this->assertInstanceOf(SingleMethodInterface::class, $container->get('bar')->foo);
         $this->assertInstanceOf(Foo::class, $container->get('bar')->foo->theMethod());
     }
+
+    /**
+     * @dataProvider getStripCommentsCodes
+     */
+    public function testStripComments(string $source, string $expected)
+    {
+        $reflection = new \ReflectionClass(PhpDumper::class);
+        $method = $reflection->getMethod('stripComments');
+
+        $output = $method->invoke(null, $source);
+
+        // Heredocs are preserved, making the output mixing Unix and Windows line
+        // endings, switching to "\n" everywhere on Windows to avoid failure.
+        if ('\\' === \DIRECTORY_SEPARATOR) {
+            $expected = str_replace("\r\n", "\n", $expected);
+            $output = str_replace("\r\n", "\n", $output);
+        }
+
+        $this->assertEquals($expected, $output);
+    }
+
+    public static function getStripCommentsCodes(): array
+    {
+        return [
+            ['<?php echo foo();', '<?php echo foo();'],
+            ['<?php echo/**/foo();', '<?php echo foo();'],
+            ['<?php echo/** bar */foo();', '<?php echo foo();'],
+            ['<?php /**/echo foo();', '<?php echo foo();'],
+            ['<?php echo \foo();', '<?php echo \foo();'],
+            ['<?php echo/**/\foo();', '<?php echo \foo();'],
+            ['<?php echo/** bar */\foo();', '<?php echo \foo();'],
+            ['<?php /**/echo \foo();', '<?php echo \foo();'],
+            [<<<'EOF'
+<?php
+include_once \dirname(__DIR__).'/foo.php';
+
+$string = 'string should not be   modified';
+
+$string = 'string should not be
+
+modified';
+
+
+$heredoc = <<<HD
+
+
+Heredoc should not be   modified {$a[1+$b]}
+
+
+HD;
+
+$nowdoc = <<<'ND'
+
+
+Nowdoc should not be   modified
+
+
+ND;
+
+/**
+ * some class comments to strip
+ */
+class TestClass
+{
+    /**
+     * some method comments to strip
+     */
+    public function doStuff()
+    {
+        // inline comment
+    }
+}
+EOF
+                , <<<'EOF'
+<?php
+include_once \dirname(__DIR__).'/foo.php';
+$string = 'string should not be   modified';
+$string = 'string should not be
+
+modified';
+$heredoc = <<<HD
+
+
+Heredoc should not be   modified {$a[1+$b]}
+
+
+HD;
+$nowdoc = <<<'ND'
+
+
+Nowdoc should not be   modified
+
+
+ND;
+class TestClass
+{
+    public function doStuff()
+    {
+        }
+}
+EOF
+            ],
+        ];
+    }
 }
 
 class Rot13EnvVarProcessor implements EnvVarProcessorInterface
diff --git a/src/Symfony/Component/HttpKernel/CHANGELOG.md b/src/Symfony/Component/HttpKernel/CHANGELOG.md
index e5d58e8cb383..1ddf5c8549ab 100644
--- a/src/Symfony/Component/HttpKernel/CHANGELOG.md
+++ b/src/Symfony/Component/HttpKernel/CHANGELOG.md
@@ -11,6 +11,7 @@ CHANGELOG
  * Add argument `$validationFailedStatusCode` to `#[MapQueryString]` and `#[MapRequestPayload]`
  * Add argument `$debug` to `Logger`
  * Add class `DebugLoggerConfigurator`
+ * Deprecate `Kernel::stripComments()`
 
 6.3
 ---
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 9ce3dca808eb..97d673bfa6c1 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -774,9 +774,13 @@ private function preBoot(): ContainerInterface
      *
      * We don't use the PHP php_strip_whitespace() function
      * as we want the content to be readable and well-formatted.
+     *
+     * @deprecated since Symfony 6.4 without replacement
      */
     public static function stripComments(string $source): string
     {
+        trigger_deprecation('symfony/http-kernel', '6.4', 'Method "%s()" is deprecated without replacement.', __METHOD__);
+
         if (!\function_exists('token_get_all')) {
             return $source;
         }
diff --git a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
index 459eafd016e7..942998eef4e9 100644
--- a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
@@ -249,9 +249,13 @@ public function testHandleBootsTheKernel()
 
     /**
      * @dataProvider getStripCommentsCodes
+     *
+     * @group legacy
      */
     public function testStripComments(string $source, string $expected)
     {
+        $this->expectDeprecation('Since symfony/http-kernel 6.4: Method "Symfony\Component\HttpKernel\Kernel::stripComments()" is deprecated without replacement.');
+
         $output = Kernel::stripComments($source);
 
         // Heredocs are preserved, making the output mixing Unix and Windows line

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