Create mysqli.phpstub

Signed-off-by: Kamil Tekiela <tekiela246@gmail.com>

src/Psalm/Config.php

@@ -1953,6 +1953,11 @@ public function visitStubFiles(Codebase $codebase, ?Progress $progress = null):
             $this->internal_stubs[] = $xdebug_stub_path;
         }
 
+        if (\extension_loaded('mysqli')) {
+            $ext_mysqli_path = $dir_lvl_2 . DIRECTORY_SEPARATOR . 'stubs' . DIRECTORY_SEPARATOR . 'mysqli.phpstub';
+            $this->internal_stubs[] = $ext_mysqli_path;
+        }
+
         foreach ($this->internal_stubs as $stub_path) {
             if (!file_exists($stub_path)) {
                 throw new \UnexpectedValueException('Cannot locate ' . $stub_path);

stubs/mysqli.phpstub

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @template TValue
+ *
+ * @template-implements Traversable<int, TValue>
+ */
+class mysqli_result implements Traversable
+{
+    /**
+     * @psalm-taint-sink callable $class
+
+     * @template T of object
+     * @param class-string<T> $class
+     * @param array $constructor_args
+     * @return T|null|false
+     */
+    function fetch_object(string $class = stdClass::class, array $constructor_args = []): object|false|null {}
+}
+
+
+/**
+    * @psalm-taint-sink callable $class
+
+    * @template T of object
+    * @param class-string<T> $class
+    * @param array $constructor_args
+    * @return T|null|false
+    */
+function mysqli_fetch_object(mysqli_result $result, string $class = stdClass::class, array $constructor_args = []): object|false|null {}