Add more tests for http_build_query()

Some with unusual types like resource and null
A lot more tests for objects

ext/standard/tests/http/http_build_query/http_build_query_object_basic.phpt

@@ -0,0 +1,17 @@
+--TEST--
+http_build_query() function with object
+--FILE--
+<?php
+class KeyVal {
+    public $public = "input";
+    protected $protected = "hello";
+    private $private = "world";
+}
+
+$o = new KeyVal();
+
+// Percent encoded "public=input"
+var_dump(http_build_query($o));
+?>
+--EXPECT--
+string(12) "public=input"

ext/standard/tests/http/http_build_query/http_build_query_object_empty.phpt

@@ -0,0 +1,11 @@
+--TEST--
+http_build_query() function with empty object
+--FILE--
+<?php
+class EmptyObj {}
+$o = new EmptyObj();
+
+var_dump(http_build_query($o));
+?>
+--EXPECT--
+string(0) ""

ext/standard/tests/http/http_build_query/http_build_query_object_just_stringable.phpt

@@ -0,0 +1,22 @@
+--TEST--
+http_build_query() function with object that is just stringable (GH-10229)
+--FILE--
+<?php
+class StringableObject {
+    public function __toString() : string {
+        return "Stringable";
+    }
+}
+
+$o = new StringableObject();
+
+var_dump(http_build_query(['hello', $o]));
+var_dump(http_build_query($o));
+var_dump(http_build_query(['hello', $o], numeric_prefix: 'prefix_'));
+var_dump(http_build_query($o, numeric_prefix: 'prefix_'));
+?>
+--EXPECT--
+string(7) "0=hello"
+string(0) ""
+string(14) "prefix_0=hello"
+string(0) ""

ext/standard/tests/http/http_build_query/http_build_query_object_key_val_stringable.phpt

@@ -0,0 +1,20 @@
+--TEST--
+http_build_query() function with recursif object
+--FILE--
+<?php
+class KeyValStringable {
+    public $public = "input";
+    protected $protected = "hello";
+    private $private = "world";
+
+    public function __toString(): string {
+        return "Stringable";
+    }
+}
+
+$o = new KeyValStringable();
+
+var_dump(http_build_query($o));
+?>
+--EXPECT--
+string(12) "public=input"

ext/standard/tests/http/http_build_query/http_build_query_object_nested.phpt

@@ -0,0 +1,20 @@
+--TEST--
+http_build_query() function with nested object
+--FILE--
+<?php
+class KeyVal {
+    public $public = "input";
+    protected $protected = "hello";
+    private $private = "world";
+}
+
+$o = new KeyVal();
+$nested = new KeyVal();
+
+$o->public = $nested;
+
+// Percent encoded "public[public]=input"
+var_dump(http_build_query($o));
+?>
+--EXPECT--
+string(24) "public%5Bpublic%5D=input"

ext/standard/tests/http/http_build_query/http_build_query_object_recursif.phpt

@@ -0,0 +1,17 @@
+--TEST--
+http_build_query() function with recursif object
+--FILE--
+<?php
+class KeyVal {
+    public $public = "input";
+    protected $protected = "hello";
+    private $private = "world";
+}
+
+$o = new KeyVal();
+$o->public = $o;
+
+var_dump(http_build_query($o));
+?>
+--EXPECT--
+string(0) ""

ext/standard/tests/http/http_build_query/http_build_query_with_null.phpt

@@ -0,0 +1,8 @@
+--TEST--
+http_build_query() function with null in array
+--FILE--
+<?php
+var_dump(http_build_query([null]));
+?>
+--EXPECT--
+string(0) ""

ext/standard/tests/http/http_build_query/http_build_query_with_references.phpt

@@ -0,0 +1,11 @@
+--TEST--
+http_build_query() function with reference in array
+--FILE--
+<?php
+$v = 'value';
+$ref = &$v;
+
+var_dump(http_build_query([$ref]));
+?>
+--EXPECT--
+string(7) "0=value"

ext/standard/tests/http/http_build_query/http_build_query_with_resource.phpt

@@ -0,0 +1,8 @@
+--TEST--
+http_build_query() function with resource in array
+--FILE--
+<?php
+var_dump(http_build_query([STDIN]));
+?>
+--EXPECT--
+string(0) ""