diff --git a/resources/functionMap.php b/resources/functionMap.php
index 704dc36f96..8e058d7419 100644
--- a/resources/functionMap.php
+++ b/resources/functionMap.php
@@ -11696,7 +11696,7 @@
 'str_replace' => ['string|array', 'search'=>'string|array', 'replace'=>'string|array', 'subject'=>'string|array', '&w_replace_count='=>'int'],
 'str_rot13' => ['string', 'str'=>'string'],
 'str_shuffle' => ['string', 'str'=>'string'],
-'str_split' => ['array<int,string>|false', 'str'=>'string', 'split_length='=>'int'],
+'str_split' => ['array<int,string>|false', 'str'=>'string', 'split_length='=>'positive-int'],
 'str_word_count' => ['array<int,string>|int|false', 'string'=>'string', 'format='=>'int', 'charlist='=>'string'],
 'strcasecmp' => ['int', 'str1'=>'string', 'str2'=>'string'],
 'strchr' => ['string|false', 'haystack'=>'string', 'needle'=>'string', 'before_needle='=>'bool'],
diff --git a/resources/functionMap_php74delta.php b/resources/functionMap_php74delta.php
index 73349639fe..ec728c0afa 100644
--- a/resources/functionMap_php74delta.php
+++ b/resources/functionMap_php74delta.php
@@ -39,7 +39,7 @@
 		'FFI::typeof' => ['FFI\CType', '&ptr'=>'FFI\CData'],
 		'FFI::type' => ['FFI\CType', 'type'=>'string'],
 		'get_mangled_object_vars' => ['array', 'obj'=>'object'],
-		'mb_str_split' => ['array<int,string>|false', 'str'=>'string', 'split_length='=>'int', 'encoding='=>'string'],
+		'mb_str_split' => ['array<int,string>|false', 'str'=>'string', 'split_length='=>'positive-int', 'encoding='=>'string'],
 		'password_algos' => ['array<int, string>'],
 		'password_hash' => ['string|false', 'password'=>'string', 'algo'=>'string|null', 'options='=>'array'],
 		'password_needs_rehash' => ['bool', 'hash'=>'string', 'algo'=>'string|null', 'options='=>'array'],
diff --git a/resources/functionMap_php80delta.php b/resources/functionMap_php80delta.php
index f1735f2a4e..7529a42ded 100644
--- a/resources/functionMap_php80delta.php
+++ b/resources/functionMap_php80delta.php
@@ -69,7 +69,7 @@
 		'imagerotate' => ['false|object', 'src_im'=>'resource', 'angle'=>'float', 'bgdcolor'=>'int', 'ignoretransparent='=>'int'],
 		'imagescale' => ['false|object', 'im'=>'resource', 'new_width'=>'int', 'new_height='=>'int', 'method='=>'int'],
 		'mb_decode_numericentity' => ['string|false', 'string'=>'string', 'convmap'=>'array', 'encoding='=>'string'],
-		'mb_str_split' => ['array<int,string>', 'str'=>'string', 'split_length='=>'int', 'encoding='=>'string'],
+		'mb_str_split' => ['array<int,string>', 'str'=>'string', 'split_length='=>'positive-int', 'encoding='=>'string'],
 		'mktime' => ['int|false', 'hour'=>'int', 'minute='=>'int', 'second='=>'int', 'month='=>'int', 'day='=>'int', 'year='=>'int'],
 		'odbc_exec' => ['resource|false', 'connection_id'=>'resource', 'query'=>'string'],
 		'parse_str' => ['void', 'encoded_string'=>'string', '&w_result'=>'array'],
@@ -83,7 +83,7 @@
 		'socket_select' => ['int|false', '&rw_read'=>'Socket[]|null', '&rw_write'=>'Socket[]|null', '&rw_except'=>'Socket[]|null', 'seconds'=>'int|null', 'microseconds='=>'int'],
 		'sodium_crypto_aead_chacha20poly1305_ietf_decrypt' => ['string|false', 'confidential_message'=>'string', 'public_message'=>'string', 'nonce'=>'string', 'key'=>'string'],
 		'str_contains' => ['bool', 'haystack'=>'string', 'needle'=>'string'],
-		'str_split' => ['array<int,string>', 'str'=>'string', 'split_length='=>'int'],
+		'str_split' => ['array<int,string>', 'str'=>'string', 'split_length='=>'positive-int'],
 		'str_ends_with' => ['bool', 'haystack'=>'string', 'needle'=>'string'],
 		'str_starts_with' => ['bool', 'haystack'=>'string', 'needle'=>'string'],
 		'strchr' => ['string|false', 'haystack'=>'string', 'needle'=>'string', 'before_needle='=>'bool'],