Mark pure mysqli_ result-metadata functions as hasSideEffects=false

Functions like mysqli_fetch_fields, mysqli_fetch_field_direct,
mysqli_num_rows, and mysqli_num_fields always return the same value
for the same mysqli_result — they read fixed metadata and don't
advance any cursor. These should not be marked as having side effects.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

bin/functionMetadata_original.php

@@ -122,8 +122,8 @@
 	'mysqli_fetch_assoc' => ['hasSideEffects' => true],
 	'mysqli_fetch_column' => ['hasSideEffects' => true],
 	'mysqli_fetch_field' => ['hasSideEffects' => true],
-	'mysqli_fetch_field_direct' => ['hasSideEffects' => true],
-	'mysqli_fetch_fields' => ['hasSideEffects' => true],
+	'mysqli_fetch_field_direct' => ['hasSideEffects' => false],
+	'mysqli_fetch_fields' => ['hasSideEffects' => false],
 	'mysqli_fetch_lengths' => ['hasSideEffects' => true],
 	'mysqli_fetch_object' => ['hasSideEffects' => true],
 	'mysqli_fetch_row' => ['hasSideEffects' => true],
@@ -151,8 +151,8 @@
 	'mysqli_more_results' => ['hasSideEffects' => true],
 	'mysqli_multi_query' => ['hasSideEffects' => true],
 	'mysqli_next_result' => ['hasSideEffects' => true],
-	'mysqli_num_fields' => ['hasSideEffects' => true],
-	'mysqli_num_rows' => ['hasSideEffects' => true],
+	'mysqli_num_fields' => ['hasSideEffects' => false],
+	'mysqli_num_rows' => ['hasSideEffects' => false],
 	'mysqli_options' => ['hasSideEffects' => true],
 	'mysqli_param_count' => ['hasSideEffects' => true],
 	'mysqli_ping' => ['hasSideEffects' => true],

resources/functionMetadata.php

@@ -1420,8 +1420,8 @@
 	'mysqli_fetch_assoc' => ['hasSideEffects' => true],
 	'mysqli_fetch_column' => ['hasSideEffects' => true],
 	'mysqli_fetch_field' => ['hasSideEffects' => true],
-	'mysqli_fetch_field_direct' => ['hasSideEffects' => true],
-	'mysqli_fetch_fields' => ['hasSideEffects' => true],
+	'mysqli_fetch_field_direct' => ['hasSideEffects' => false],
+	'mysqli_fetch_fields' => ['hasSideEffects' => false],
 	'mysqli_fetch_lengths' => ['hasSideEffects' => true],
 	'mysqli_fetch_object' => ['hasSideEffects' => true],
 	'mysqli_fetch_row' => ['hasSideEffects' => true],
@@ -1449,8 +1449,8 @@
 	'mysqli_more_results' => ['hasSideEffects' => true],
 	'mysqli_multi_query' => ['hasSideEffects' => true],
 	'mysqli_next_result' => ['hasSideEffects' => true],
-	'mysqli_num_fields' => ['hasSideEffects' => true],
-	'mysqli_num_rows' => ['hasSideEffects' => true],
+	'mysqli_num_fields' => ['hasSideEffects' => false],
+	'mysqli_num_rows' => ['hasSideEffects' => false],
 	'mysqli_options' => ['hasSideEffects' => true],
 	'mysqli_param_count' => ['hasSideEffects' => true],
 	'mysqli_ping' => ['hasSideEffects' => true],