Mark mysqli_connect as having side effects in function metadata

mysqli_connect establishes a network connection to a database server,
which is inherently a side effect. Marking it as hasSideEffects => true
causes TypeSpecifier to return empty SpecifiedTypes for the call, which
prevents stale conditional expressions from being created and fixes the
false positive logicalOr.leftAlwaysTrue on repeated calls.

Fixes phpstan/phpstan#14473

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

Author: phpstan-bot

bin/functionMetadata_original.php

@@ -94,6 +94,7 @@
 	'link' => ['hasSideEffects' => true],
 	'mkdir' => ['hasSideEffects' => true],
 	'move_uploaded_file' => ['hasSideEffects' => true],
+	'mysqli_connect' => ['hasSideEffects' => true],
 	'ob_clean' => ['hasSideEffects' => true],
 	'ob_end_clean' => ['hasSideEffects' => true],
 	'ob_end_flush' => ['hasSideEffects' => true],

resources/functionMetadata.php

@@ -1392,6 +1392,7 @@
 	'msgfmt_parse_message' => ['hasSideEffects' => false],
 	'mt_getrandmax' => ['hasSideEffects' => false],
 	'mt_rand' => ['hasSideEffects' => true],
+	'mysqli_connect' => ['hasSideEffects' => true],
 	'net_get_interfaces' => ['hasSideEffects' => false],
 	'ngettext' => ['hasSideEffects' => false],
 	'nl2br' => ['hasSideEffects' => false],