diff --git a/resources/functionMap.php b/resources/functionMap.php
index 2774105217..5b31aa5b92 100644
--- a/resources/functionMap.php
+++ b/resources/functionMap.php
@@ -11798,7 +11798,7 @@
 'strtr' => ['string', 'str'=>'string', 'from'=>'string', 'to'=>'string'],
 'strtr\'1' => ['string', 'str'=>'string', 'replace_pairs'=>'array'],
 'strval' => ['string', 'var'=>'mixed'],
-'substr' => ['string', 'string'=>'string', 'start'=>'int', 'length='=>'int'],
+'substr' => ['__benevolent<string|false>', 'string'=>'string', 'start'=>'int', 'length='=>'int'],
 'substr_compare' => ['int|false', 'main_str'=>'string', 'str'=>'string', 'offset'=>'int', 'length='=>'int', 'case_sensitivity='=>'bool'],
 'substr_count' => ['0|positive-int', 'haystack'=>'string', 'needle'=>'string', 'offset='=>'int', 'length='=>'int'],
 'substr_replace' => ['string|array', 'str'=>'string|array', 'repl'=>'mixed', 'start'=>'mixed', 'length='=>'mixed'],
diff --git a/resources/functionMap_php80delta.php b/resources/functionMap_php80delta.php
index 74e26d108e..dd7212a314 100644
--- a/resources/functionMap_php80delta.php
+++ b/resources/functionMap_php80delta.php
@@ -102,6 +102,7 @@
 		'strripos' => ['int|false', 'haystack'=>'string', 'needle'=>'string', 'offset='=>'int'],
 		'strrpos' => ['int|false', 'haystack'=>'string', 'needle'=>'string', 'offset='=>'int'],
 		'strstr' => ['string|false', 'haystack'=>'string', 'needle'=>'string', 'before_needle='=>'bool'],
+		'substr' => ['string', 'string'=>'string', 'start'=>'int', 'length='=>'int'],
 		'version_compare' => ['int|bool', 'version1'=>'string', 'version2'=>'string', 'operator='=>'string'],
 		'xml_parser_create' => ['XMLParser', 'encoding='=>'string'],
 		'xml_parser_create_ns' => ['XMLParser', 'encoding='=>'string', 'sep='=>'string'],
@@ -227,6 +228,7 @@
 		'strripos' => ['int|false', 'haystack'=>'string', 'needle'=>'string|int', 'offset='=>'int'],
 		'strrpos' => ['int|false', 'haystack'=>'string', 'needle'=>'string|int', 'offset='=>'int'],
 		'strstr' => ['string|false', 'haystack'=>'string', 'needle'=>'string|int', 'before_needle='=>'bool'],
+		'substr' => ['__benevolent<string|false>', 'string'=>'string', 'start'=>'int', 'length='=>'int'],
 		'version_compare' => ['int|bool', 'version1'=>'string', 'version2'=>'string', 'operator='=>'string'],
 		'xml_parser_create' => ['resource', 'encoding='=>'string'],
 		'xml_parser_create_ns' => ['resource', 'encoding='=>'string', 'sep='=>'string'],