diff --git a/dictionaries/CallMap.php b/dictionaries/CallMap.php
index 3b24486c9..a4fb3d98d 100644
--- a/dictionaries/CallMap.php
+++ b/dictionaries/CallMap.php
@@ -7283,7 +7283,7 @@ return [
 'mb_scrub' => ['string', 'string'=>'string', 'encoding='=>'string|null'],
 'mb_send_mail' => ['bool', 'to'=>'string', 'subject'=>'string', 'message'=>'string', 'additional_headers='=>'string|array', 'additional_params='=>'string|null'],
 'mb_split' => ['list<string>', 'pattern'=>'string', 'string'=>'string', 'limit='=>'int'],
-'mb_str_split' => ['list<string>', 'string'=>'string', 'length='=>'int', 'encoding='=>'string|null'],
+'mb_str_split' => ['non-empty-list<string>', 'string'=>'string', 'length='=>'positive-int', 'encoding='=>'string|null'],
 'mb_strcut' => ['string', 'string'=>'string', 'start'=>'int', 'length='=>'?int', 'encoding='=>'string|null'],
 'mb_strimwidth' => ['string', 'string'=>'string', 'start'=>'int', 'width'=>'int', 'trim_marker='=>'string', 'encoding='=>'string|null'],
 'mb_stripos' => ['int|false', 'haystack'=>'string', 'needle'=>'string', 'offset='=>'int', 'encoding='=>'string|null'],
@@ -13734,7 +13734,7 @@ return [
 'str_replace' => ['string|string[]', 'search'=>'string|array', 'replace'=>'string|array', 'subject'=>'string|array', '&w_count='=>'int'],
 'str_rot13' => ['string', 'string'=>'string'],
 'str_shuffle' => ['string', 'string'=>'string'],
-'str_split' => ['list<string>|false', 'string'=>'string', 'length='=>'int'],
+'str_split' => ['non-empty-list<string>', 'string'=>'string', 'length='=>'positive-int'],
 'str_starts_with' => ['bool', 'haystack'=>'string', 'needle'=>'string'],
 'str_word_count' => ['array<int, string>|int', 'string'=>'string', 'format='=>'int', 'characters='=>'string'],
 'strcasecmp' => ['int', 'string1'=>'string', 'string2'=>'string'],
diff --git a/dictionaries/CallMap_74_delta.php b/dictionaries/CallMap_74_delta.php
index 31614800c..74d78b25e 100644
--- a/dictionaries/CallMap_74_delta.php
+++ b/dictionaries/CallMap_74_delta.php
@@ -7,7 +7,7 @@
  * The 'added' section contains function/method names from FunctionSignatureMap (And alternates, if applicable) that do not exist in php 7.3
  * The 'removed' section contains the signatures that were removed in php 7.4.
  * The 'changed' section contains functions for which the signature has changed for php 7.4.
- *     Each function in the 'changed' section has an 'old' and a 'new' section, 
+ *     Each function in the 'changed' section has an 'old' and a 'new' section,
  *     representing the function as it was in PHP 7.3 and in PHP 7.4, respectively
  *
  * @see CallMap.php
@@ -17,7 +17,7 @@
 return [
   'added' => [
     'ReflectionProperty::getType' => ['?ReflectionType'],
-    'mb_str_split' => ['list<string>|false', 'string'=>'string', 'length='=>'int', 'encoding='=>'string'],
+    'mb_str_split' => ['non-empty-list<string>|false', 'string'=>'string', 'length='=>'positive-int', 'encoding='=>'string'],
   ],
   'changed' => [
     'gzread' => [
diff --git a/dictionaries/CallMap_80_delta.php b/dictionaries/CallMap_80_delta.php
index 6f91b2f55..b28e61252 100644
--- a/dictionaries/CallMap_80_delta.php
+++ b/dictionaries/CallMap_80_delta.php
@@ -818,8 +818,8 @@ return [
       'new' => ['bool', 'to'=>'string', 'subject'=>'string', 'message'=>'string', 'additional_headers='=>'string|array', 'additional_params='=>'string|null'],
     ],
     'mb_str_split' => [
-      'old' => ['list<string>|false', 'string'=>'string', 'length='=>'int', 'encoding='=>'string'],
-      'new' => ['list<string>', 'string'=>'string', 'length='=>'int', 'encoding='=>'string|null'],
+      'old' => ['non-empty-list<string>|false', 'string'=>'string', 'length='=>'positive-int', 'encoding='=>'string'],
+      'new' => ['non-empty-list<string>', 'string'=>'string', 'length='=>'positive-int', 'encoding='=>'string|null'],
     ],
     'mb_strcut' => [
       'old' => ['string', 'string'=>'string', 'start'=>'int', 'length='=>'?int', 'encoding='=>'string'],
diff --git a/dictionaries/CallMap_historical.php b/dictionaries/CallMap_historical.php
index 6fc491d35..373f8e3c5 100644
--- a/dictionaries/CallMap_historical.php
+++ b/dictionaries/CallMap_historical.php
@@ -15111,7 +15111,7 @@ return [
     'str_replace' => ['string|string[]', 'search'=>'string|array', 'replace'=>'string|array', 'subject'=>'string|array', '&w_count='=>'int'],
     'str_rot13' => ['string', 'string'=>'string'],
     'str_shuffle' => ['string', 'string'=>'string'],
-    'str_split' => ['list<string>|false', 'string'=>'string', 'length='=>'int'],
+    'str_split' => ['non-empty-list<string>', 'string'=>'string', 'length='=>'positive-int'],
     'str_word_count' => ['array<int, string>|int', 'string'=>'string', 'format='=>'int', 'characters='=>'string'],
     'strcasecmp' => ['int', 'string1'=>'string', 'string2'=>'string'],
     'strchr' => ['string|false', 'haystack'=>'string', 'needle'=>'string|int', 'before_needle='=>'bool'],