feature #226 [Php80] Add get_debug_type() (nicolas-grekas)

This PR was merged into the 1.15-dev branch.

Discussion
----------

[Php80] Add get_debug_type()

Waiting for
- [ ] php/php-src#5143
- [ ] https://wiki.php.net/rfc/get_debug_type
- [x] php/php-src#5153

Commits
-------

61168ea [Php80] Add get_debug_type()

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()) {

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)
 

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); }
+    }
 }