diff --git a/README.md b/README.md
index 9b2885a50..5f6391fca 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,7 @@ Polyfills are provided for:
 - the `array_find`, `array_find_key`, `array_any` and `array_all` functions introduced in PHP 8.4;
 - the `Deprecated` attribute introduced in PHP 8.4;
 - the `mb_trim`, `mb_ltrim` and `mb_rtrim` functions introduced in PHP 8.4;
+- the `ReflectionConstant` class introduced in PHP 8.4
 - the `CURL_HTTP_VERSION_3` and `CURL_HTTP_VERSION_3ONLY` constants introduced in PHP 8.4;
 - the `grapheme_str_split` function introduced in PHP 8.4;
 - the `bcdivmod` function introduced in PHP 8.4;
diff --git a/src/Php84/Php84.php b/src/Php84/Php84.php
index defa2fd10..1eea63afb 100644
--- a/src/Php84/Php84.php
+++ b/src/Php84/Php84.php
@@ -210,7 +210,7 @@ public static function bcdivmod(string $num1, string $num2, ?int $scale = null):
         if (null === $quot = \bcdiv($num1, $num2, 0)) {
             return null;
         }
-        $scale = $scale ?? (\PHP_VERSION_ID >= 70300 ? \bcscale() : (ini_get('bcmath.scale') ?: 0);
+        $scale = $scale ?? (\PHP_VERSION_ID >= 70300 ? \bcscale() : (ini_get('bcmath.scale') ?: 0));
 
         return [$quot, \bcmod($num1, $num2, $scale)];
     }
diff --git a/src/Php84/README.md b/src/Php84/README.md
index 39493600e..15445c6de 100644
--- a/src/Php84/README.md
+++ b/src/Php84/README.md
@@ -11,6 +11,7 @@ This component provides features added to PHP 8.4 core:
 - [`grapheme_str_split`](https://wiki.php.net/rfc/grapheme_str_split)
 - [`mb_trim`, `mb_ltrim` and `mb_rtrim`](https://wiki.php.net/rfc/mb_trim)
 - [`mb_ucfirst` and `mb_lcfirst`](https://wiki.php.net/rfc/mb_ucfirst)
+- [`ReflectionConstant`](https://github.com/php/php-src/pull/13669)
 
 More information can be found in the
 [main Polyfill README](https://github.com/symfony/polyfill/blob/main/README.md).
diff --git a/src/Php84/Resources/stubs/ReflectionConstant.php b/src/Php84/Resources/stubs/ReflectionConstant.php
new file mode 100644
index 000000000..f4c8448bf
--- /dev/null
+++ b/src/Php84/Resources/stubs/ReflectionConstant.php
@@ -0,0 +1,158 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+if (\PHP_VERSION_ID < 80400) {
+    /**
+     * @author Daniel Scherzer <daniel.e.scherzer@gmail.com>
+     */
+    final class ReflectionConstant
+    {
+        /**
+         * @var string
+         *
+         * @readonly
+         */
+        public $name;
+
+        private $value;
+        private $deprecated;
+
+        private static $persistentConstants = [];
+
+        public function __construct(string $name)
+        {
+            if (!defined($name) || false !== strpos($name, '::')) {
+                throw new ReflectionException("Constant \"$name\" does not exist");
+            }
+
+            $this->name = ltrim($name, '\\');
+            $deprecated = false;
+            $eh = set_error_handler(static function ($type, $msg, $file, $line) use ($name, &$deprecated, &$eh) {
+                if (\E_DEPRECATED === $type && "Constant $name is deprecated" === $msg) {
+                    return $deprecated = true;
+                }
+
+                return $eh && $eh($type, $msg, $file, $line);
+            });
+
+            try {
+                $this->value = constant($name);
+                $this->deprecated = $deprecated;
+            } finally {
+                restore_error_handler();
+            }
+        }
+
+        public function getName(): string
+        {
+            return $this->name;
+        }
+
+        public function getValue()
+        {
+            return $this->value;
+        }
+
+        public function getNamespaceName(): string
+        {
+            if (false === $slashPos = strrpos($this->name, '\\')) {
+                return '';
+            }
+
+            return substr($this->name, 0, $slashPos);
+        }
+
+        public function getShortName(): string
+        {
+            if (false === $slashPos = strrpos($this->name, '\\')) {
+                return $this->name;
+            }
+
+            return substr($this->name, $slashPos + 1);
+        }
+
+        public function isDeprecated(): bool
+        {
+            return $this->deprecated;
+        }
+
+        public function __toString(): string
+        {
+            // A constant is persistent if provided by PHP itself rather than
+            // being defined by users. If we got here, we know that it *is*
+            // defined, so we just need to figure out if it is defined by the
+            // user or not
+            if (!self::$persistentConstants) {
+                $persistentConstants = get_defined_constants(true);
+                unset($persistentConstants['user']);
+                foreach ($persistentConstants as $constants) {
+                    self::$persistentConstants += $constants;
+                }
+            }
+            $persistent = array_key_exists($this->name, self::$persistentConstants);
+
+            // Can't match the inclusion of `no_file_cache` but the rest is
+            // possible to match
+            $result = 'Constant [ ';
+            if ($persistent || $this->deprecated) {
+                $result .= '<';
+                if ($persistent) {
+                    $result .= 'persistent';
+                    if ($this->deprecated) {
+                        $result .= ', ';
+                    }
+                }
+                if ($this->deprecated) {
+                    $result .= 'deprecated';
+                }
+                $result .= '> ';
+            }
+            // Cannot just use gettype() to match zend_zval_type_name()
+            if (is_object($this->value)) {
+                $result .= \PHP_VERSION_ID >= 80000 ? get_debug_type($this->value) : gettype($this->value);
+            } elseif (is_bool($this->value)) {
+                $result .= 'bool';
+            } elseif (is_int($this->value)) {
+                $result .= 'int';
+            } elseif (is_float($this->value)) {
+                $result .= 'float';
+            } elseif (null === $this->value) {
+                $result .= 'null';
+            } else {
+                $result .= gettype($this->value);
+            }
+            $result .= ' ';
+            $result .= $this->name;
+            $result .= ' ] { ';
+            if (is_array($this->value)) {
+                $result .= 'Array';
+            } else {
+                // This will throw an exception if the value is an object that
+                // cannot be converted to string; that is expected and matches
+                // the behavior of zval_get_string_func()
+                $result .= (string) $this->value;
+            }
+            $result .= " }\n";
+
+            return $result;
+        }
+
+        public function __sleep(): array
+        {
+            throw new Exception("Serialization of 'ReflectionConstant' is not allowed");
+        }
+
+        public function __wakeup(): void
+        {
+            throw new Exception("Unserialization of 'ReflectionConstant' is not allowed");
+        }
+    }
+}
diff --git a/tests/Php84/ReflectionConstantTest.php b/tests/Php84/ReflectionConstantTest.php
new file mode 100644
index 000000000..53e6b947d
--- /dev/null
+++ b/tests/Php84/ReflectionConstantTest.php
@@ -0,0 +1,164 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Polyfill\Tests\Php84;
+
+use PHPUnit\Framework\TestCase;
+
+const EXAMPLE = 'Foo';
+
+class ExampleNonStringable
+{
+    protected $value;
+
+    public function __construct(string $value)
+    {
+        $this->value = $value;
+    }
+}
+
+class ExampleStringable extends ExampleNonStringable
+{
+    public function __toString(): string
+    {
+        return 'ExampleStringable (value='.$this->value.')';
+    }
+}
+
+/**
+ * @author Daniel Scherzer <daniel.e.scherzer@gmail.com>
+ */
+class ReflectionConstantTest extends TestCase
+{
+    public function testMissingConstant()
+    {
+        $this->expectException(\ReflectionException::class);
+        $this->expectExceptionMessage('Constant "missing" does not exist');
+        new \ReflectionConstant('missing');
+    }
+
+    public function testClassConstant()
+    {
+        $this->assertTrue(\defined('ReflectionFunction::IS_DEPRECATED'));
+
+        $this->expectException(\ReflectionException::class);
+        $this->expectExceptionMessage('Constant "ReflectionClass::IS_DEPRECATED" does not exist');
+        new \ReflectionConstant('ReflectionClass::IS_DEPRECATED');
+    }
+
+    public function testBuiltInConstant()
+    {
+        $constant = new \ReflectionConstant('E_ERROR');
+        $this->assertSame('E_ERROR', $constant->name);
+        $this->assertSame('E_ERROR', $constant->getName());
+        $this->assertSame('', $constant->getNamespaceName());
+        $this->assertSame('E_ERROR', $constant->getShortName());
+        $this->assertSame(\E_ERROR, $constant->getValue());
+        $this->assertFalse($constant->isDeprecated());
+        $this->assertSame("Constant [ <persistent> int E_ERROR ] { 1 }\n", (string) $constant);
+    }
+
+    public function testUserConstant()
+    {
+        \define('TESTING', 123);
+
+        $constant = new \ReflectionConstant('TESTING');
+        $this->assertSame('TESTING', $constant->name);
+        $this->assertSame('TESTING', $constant->getName());
+        $this->assertSame('', $constant->getNamespaceName());
+        $this->assertSame('TESTING', $constant->getShortName());
+        $this->assertSame(TESTING, $constant->getValue());
+        $this->assertFalse($constant->isDeprecated());
+        $this->assertSame("Constant [ int TESTING ] { 123 }\n", (string) $constant);
+    }
+
+    public function testNamespacedConstant()
+    {
+        $constant = new \ReflectionConstant(EXAMPLE::class);
+        $this->assertSame(EXAMPLE::class, $constant->name);
+        $this->assertSame(EXAMPLE::class, $constant->getName());
+        $this->assertSame(__NAMESPACE__, $constant->getNamespaceName());
+        $this->assertSame('EXAMPLE', $constant->getShortName());
+        $this->assertSame(EXAMPLE, $constant->getValue());
+        $this->assertFalse($constant->isDeprecated());
+        $this->assertSame("Constant [ string Symfony\\Polyfill\\Tests\\Php84\\EXAMPLE ] { Foo }\n", (string) $constant);
+    }
+
+    public function testDeprecated()
+    {
+        $constant = new \ReflectionConstant('MT_RAND_PHP');
+        $this->assertSame('MT_RAND_PHP', $constant->name);
+        $this->assertSame('MT_RAND_PHP', $constant->getName());
+        $this->assertSame('', $constant->getNamespaceName());
+        $this->assertSame('MT_RAND_PHP', $constant->getShortName());
+        $this->assertSame(1, $constant->getValue());
+        if (\PHP_VERSION_ID >= 80300) {
+            $this->assertTrue($constant->isDeprecated());
+            $this->assertSame("Constant [ <persistent, deprecated> int MT_RAND_PHP ] { 1 }\n", (string) $constant);
+        } else {
+            $this->assertFalse($constant->isDeprecated());
+            $this->assertSame("Constant [ <persistent> int MT_RAND_PHP ] { 1 }\n", (string) $constant);
+        }
+    }
+
+    public function testNonStringable()
+    {
+        if (\PHP_VERSION_ID < 80100) {
+            $this->markTestSkipped('Constants can only be objects since PHP 8.1');
+        }
+        $value = new ExampleNonStringable('Testing');
+        \define('NonStringable', $value);
+
+        $constant = new \ReflectionConstant('NonStringable');
+
+        // No error version of expectException()
+        try {
+            (string) $constant;
+            $this->fail('Error should be thrown');
+        } catch (\Error $e) {
+            $this->assertSame("Object of class Symfony\Polyfill\Tests\Php84\ExampleNonStringable could not be converted to string", $e->getMessage());
+        }
+    }
+
+    public function testStringable()
+    {
+        if (\PHP_VERSION_ID < 80100) {
+            $this->markTestSkipped('Constants can only be objects since PHP 8.1');
+        }
+        $value = new ExampleStringable('Testing');
+        \define('IsStringable', $value);
+
+        $constant = new \ReflectionConstant('IsStringable');
+
+        $this->assertSame("Constant [ Symfony\Polyfill\Tests\Php84\ExampleStringable IsStringable ] { ExampleStringable (value=Testing) }\n", (string) $constant);
+    }
+
+    public function testSerialization()
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage("Serialization of 'ReflectionConstant' is not allowed");
+
+        $r = new \ReflectionConstant('PHP_VERSION');
+        serialize($r);
+    }
+
+    public function testUnserialization()
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage("Unserialization of 'ReflectionConstant' is not allowed");
+        unserialize(
+            'O:18:"ReflectionConstant":4:{s:4:"name";'.
+            "s:11:\"PHP_VERSION\";s:25:\"\0ReflectionConstant\0value\";s:6:\"8.3.19\";".
+            "s:30:\"\0ReflectionConstant\0deprecated\";b:0;".
+            "s:30:\"\0ReflectionConstant\0persistent\";b:1;}"
+        );
+    }
+}