RFC: Make the iterator_*() family accept all iterables (#8819)

https://wiki.php.net/rfc/iterator_xyz_accept_array

NEWS

@@ -48,6 +48,10 @@ PHP                                                                        NEWS
 - Random:
   . Added new random extension. (Go Kudo)
 
+- SPL:
+  . Widen iterator_to_array() and iterator_count()'s $iterator parameter to
+    iterable. (timwolla)
+
 - Standard:
   . Fixed empty array returned by str_split on empty input. (Michael Vorisek)
   . Added ini_parse_quantity function to convert ini quantities shorthand

UPGRADING

@@ -189,6 +189,11 @@ PHP 8.2 UPGRADE NOTES
     dba_fetch(string|array $key, $skip, $dba): string|false
     is still accepted, but it is recommended to use the new standard variant.
 
+- SPL
+  . The $iterator parameter of iterator_to_array() and iterator_count() is
+    widened to iterable from Iterator, allowing arrays to be passed.
+    RFC: https://wiki.php.net/rfc/iterator_xyz_accept_array
+
 ========================================
 6. New Functions
 ========================================

ext/spl/php_spl.stub.php

@@ -48,7 +48,7 @@ function spl_object_id(object $object): int {}
 
 function iterator_apply(Traversable $iterator, callable $callback, ?array $args = null): int {}
 
-function iterator_count(Traversable $iterator): int {}
+function iterator_count(iterable $iterator): int {}
 
 /** @refcount 1 */
-function iterator_to_array(Traversable $iterator, bool $preserve_keys = true): array {}
+function iterator_to_array(iterable $iterator, bool $preserve_keys = true): array {}

ext/spl/spl_iterators.c

@@ -3171,8 +3171,18 @@ PHP_FUNCTION(iterator_to_array)
 	zval  *obj;
 	bool use_keys = 1;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|b", &obj, zend_ce_traversable, &use_keys) == FAILURE) {
-		RETURN_THROWS();
+	ZEND_PARSE_PARAMETERS_START(1, 2)
+		Z_PARAM_ITERABLE(obj)
+		Z_PARAM_OPTIONAL
+		Z_PARAM_BOOL(use_keys)
+	ZEND_PARSE_PARAMETERS_END();
+
+	if (Z_TYPE_P(obj) == IS_ARRAY) {
+		if (use_keys) {
+			RETURN_COPY(obj);
+		} else {
+			RETURN_ARR(zend_array_to_list(Z_ARRVAL_P(obj)));
+		}
 	}
 
 	array_init(return_value);
@@ -3195,12 +3205,16 @@ PHP_FUNCTION(iterator_count)
 	zval  *obj;
 	zend_long  count = 0;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O", &obj, zend_ce_traversable) == FAILURE) {
-		RETURN_THROWS();
-	}
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_ITERABLE(obj)
+	ZEND_PARSE_PARAMETERS_END();
 
-	if (spl_iterator_apply(obj, spl_iterator_count_apply, (void*)&count) == FAILURE) {
-		return;
+	if (Z_TYPE_P(obj) == IS_ARRAY) {
+		count =  zend_hash_num_elements(Z_ARRVAL_P(obj));
+	} else {
+		if (spl_iterator_apply(obj, spl_iterator_count_apply, (void*)&count) == FAILURE) {
+			RETURN_THROWS();
+		}
 	}
 
 	RETURN_LONG(count);

ext/spl/tests/iterator_count.phpt

@@ -13,7 +13,7 @@ iterator_count('1');
 
 ?>
 --EXPECTF--
-Fatal error: Uncaught TypeError: iterator_count(): Argument #1 ($iterator) must be of type Traversable, string given in %s:%d
+Fatal error: Uncaught TypeError: iterator_count(): Argument #1 ($iterator) must be of type Traversable|array, string given in %s:%d
 Stack trace:
 #0 %s(%d): iterator_count('1')
 #1 {main}

ext/spl/tests/iterator_count_array.phpt

@@ -0,0 +1,14 @@
+--TEST--
+SPL: iterator_count() supports arrays.
+--FILE--
+<?php
+
+var_dump(iterator_count([]));
+var_dump(iterator_count([1]));
+var_dump(iterator_count(['a' => 1, 'b' => 2, 5 => 3]));
+
+?>
+--EXPECT--
+int(0)
+int(1)
+int(3)

ext/spl/tests/iterator_count_exception.phpt

@@ -0,0 +1,20 @@
+--TEST--
+SPL: iterator_count() throws if the Iterator throws
+--FILE--
+<?php
+
+function generator() {
+  yield 1;
+  throw new Exception('Iterator failed');
+}
+
+var_dump(iterator_count(generator()));
+
+?>
+--EXPECTF--
+Fatal error: Uncaught Exception: Iterator failed in %siterator_count_exception.php:5
+Stack trace:
+#0 [internal function]: generator()
+#1 %siterator_count_exception.php(8): iterator_count(Object(Generator))
+#2 {main}
+  thrown in %siterator_count_exception.php on line 5

ext/spl/tests/iterator_to_array.phpt

@@ -13,7 +13,7 @@ iterator_to_array('test','test');
 
 ?>
 --EXPECTF--
-Fatal error: Uncaught TypeError: iterator_to_array(): Argument #1 ($iterator) must be of type Traversable, string given in %s:%d
+Fatal error: Uncaught TypeError: iterator_to_array(): Argument #1 ($iterator) must be of type Traversable|array, string given in %s:%d
 Stack trace:
 #0 %s(%d): iterator_to_array('test', 'test')
 #1 {main}

ext/spl/tests/iterator_to_array_array.phpt

@@ -0,0 +1,42 @@
+--TEST--
+SPL: iterator_to_array() supports arrays.
+--FILE--
+<?php
+
+var_dump(iterator_to_array([]));
+var_dump(iterator_to_array([1]));
+var_dump(iterator_to_array(['a' => 1, 'b' => 2, 5 => 3]));
+var_dump(iterator_to_array([], false));
+var_dump(iterator_to_array([1], false));
+var_dump(iterator_to_array(['a' => 1, 'b' => 2, 5 => 3], false));
+
+?>
+--EXPECT--
+array(0) {
+}
+array(1) {
+  [0]=>
+  int(1)
+}
+array(3) {
+  ["a"]=>
+  int(1)
+  ["b"]=>
+  int(2)
+  [5]=>
+  int(3)
+}
+array(0) {
+}
+array(1) {
+  [0]=>
+  int(1)
+}
+array(3) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(2)
+  [2]=>
+  int(3)
+}