diff --git a/README.md b/README.md
index c8602c8e..ff864dd8 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ Polyfills are provided for:
 - the `get_mangled_object_vars`, `mb_str_split` and `password_algos` functions
   introduced in PHP 7.4;
 - the `fdiv` function introduced in PHP 8.0;
+- the `get_debug_type` function introduced in PHP 8.0;
 - the `preg_last_error_msg` function introduced in PHP 8.0;
 - the `str_contains` function introduced in PHP 8.0;
 - the `ValueError` class introduced in PHP 8.0;
diff --git a/src/Php80/Php80.php b/src/Php80/Php80.php
index 557ace2b..4606980c 100644
--- a/src/Php80/Php80.php
+++ b/src/Php80/Php80.php
@@ -14,6 +14,7 @@
 /**
  * @author Ion Bazan <ion.bazan@gmail.com>
  * @author Nico Oelgart <nicoswd@gmail.com>
+ * @author Nicolas Grekas <p@tchwork.com>
  *
  * @internal
  */
@@ -24,6 +25,38 @@ public static function fdiv(float $dividend, float $divisor): float
         return @($dividend / $divisor);
     }
 
+    public static function get_debug_type($value): string
+    {
+        switch (true) {
+            case null === $value: return 'null';
+            case \is_bool($value): return 'bool';
+            case \is_string($value): return 'string';
+            case \is_array($value): return 'array';
+            case \is_int($value): return 'int';
+            case \is_float($value): return 'float';
+            case \is_object($value): break;
+            case $value instanceof \__PHP_Incomplete_Class: return '__PHP_Incomplete_Class';
+            default:
+                if (null === $type = @get_resource_type($value)) {
+                    return 'unknown';
+                }
+
+                if ('Unknown' === $type) {
+                    $type = 'closed';
+                }
+
+                return "resource ($type)";
+        }
+
+        $class = \get_class($value);
+
+        if (false === strpos($class, '@')) {
+            return $class;
+        }
+
+        return (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous';
+    }
+
     public static function preg_last_error_msg(): string
     {
         switch (preg_last_error()) {
diff --git a/src/Php80/README.md b/src/Php80/README.md
index e569c113..f87b33db 100644
--- a/src/Php80/README.md
+++ b/src/Php80/README.md
@@ -7,6 +7,7 @@ This component provides features added to PHP 8.0 core:
 - [`fdiv`](https://php.net/fdiv)
 - `ValueError` class
 - `FILTER_VALIDATE_BOOL` constant
+- [`get_debug_type`](https://php.net/get_debug_type)
 - [`preg_last_error_msg`](https://php.net/preg_last_error_msg)
 - [`str_contains`](https://php.net/str_contains)
 
diff --git a/src/Php80/bootstrap.php b/src/Php80/bootstrap.php
index 6b1d27d9..489be5e5 100644
--- a/src/Php80/bootstrap.php
+++ b/src/Php80/bootstrap.php
@@ -27,4 +27,8 @@ function str_contains(string $haystack, string $needle): bool { return p\Php80::
     if (!defined('FILTER_VALIDATE_BOOL') && defined('FILTER_VALIDATE_BOOLEAN')) {
         define('FILTER_VALIDATE_BOOL', FILTER_VALIDATE_BOOLEAN);
     }
+
+    if (!function_exists('get_debug_type')) {
+        function get_debug_type($value): string { return p\Php80::get_debug_type($value); }
+    }
 }
diff --git a/tests/Php80/Php80Test.php b/tests/Php80/Php80Test.php
index ba5233d3..e4f0c87e 100644
--- a/tests/Php80/Php80Test.php
+++ b/tests/Php80/Php80Test.php
@@ -155,6 +155,34 @@ public function invalidFloatProvider()
         );
     }
 
+    /**
+     * @covers \Symfony\Polyfill\Php80\Php80::get_debug_type
+     */
+    public function testGetDebugType()
+    {
+        $this->assertSame(__CLASS__, get_debug_type($this));
+        $this->assertSame('stdClass', get_debug_type(new \stdClass()));
+        $this->assertSame('class@anonymous', get_debug_type(eval('return new class() {};')));
+        $this->assertSame('stdClass@anonymous', get_debug_type(eval('return new class() extends stdClass {};')));
+        $this->assertSame('Reflector@anonymous', get_debug_type(eval('return new class() implements Reflector { function __toString() {} public static function export() {} };')));
+
+        $this->assertSame('string', get_debug_type('foo'));
+        $this->assertSame('bool', get_debug_type(false));
+        $this->assertSame('bool', get_debug_type(true));
+        $this->assertSame('null', get_debug_type(null));
+        $this->assertSame('array', get_debug_type(array()));
+        $this->assertSame('int', get_debug_type(1));
+        $this->assertSame('float', get_debug_type(1.2));
+        $this->assertSame('resource (stream)', get_debug_type($h = fopen(__FILE__, 'r')));
+        $this->assertSame('resource (closed)', get_debug_type(fclose($h) ? $h : $h));
+
+        $unserializeCallbackHandler = ini_set('unserialize_callback_func', null);
+        $var = unserialize('O:8:"Foo\Buzz":0:{}');
+        ini_set('unserialize_callback_func', $unserializeCallbackHandler);
+
+        $this->assertSame('__PHP_Incomplete_Class', get_debug_type($var));
+    }
+
     public function setExpectedException($exception, $message = '', $code = null)
     {
         if (!class_exists('PHPUnit\Framework\Error\Notice')) {