Fix invalid casts int and float

config.xsd

@@ -462,6 +462,7 @@
             <xs:element name="RedundantIdentityWithTrue" type="IssueHandlerType" minOccurs="0" />
             <xs:element name="ReferenceConstraintViolation" type="IssueHandlerType" minOccurs="0" />
             <xs:element name="ReservedWord" type="IssueHandlerType" minOccurs="0" />
+            <xs:element name="RiskyCast" type="IssueHandlerType" minOccurs="0" />
             <xs:element name="StringIncrement" type="IssueHandlerType" minOccurs="0" />
             <xs:element name="TaintedCallable" type="IssueHandlerType" minOccurs="0" />
             <xs:element name="TaintedCookie" type="IssueHandlerType" minOccurs="0" />

dictionaries/CallMap.php

@@ -11714,7 +11714,7 @@
 'rewind' => ['bool', 'stream'=>'resource'],
 'rewinddir' => ['null|false', 'dir_handle='=>'resource'],
 'rmdir' => ['bool', 'directory'=>'string', 'context='=>'resource'],
-'round' => ['float', 'num'=>'float', 'precision='=>'int', 'mode='=>'int'],
+'round' => ['float', 'num'=>'float', 'precision='=>'int', 'mode='=>'0|positive-int'],
 'rpm_close' => ['bool', 'rpmr'=>'resource'],
 'rpm_get_tag' => ['mixed', 'rpmr'=>'resource', 'tagnum'=>'int'],
 'rpm_is_valid' => ['bool', 'filename'=>'string'],

dictionaries/CallMap_historical.php

@@ -14751,7 +14751,7 @@
     'rewind' => ['bool', 'stream'=>'resource'],
     'rewinddir' => ['null|false', 'dir_handle='=>'resource'],
     'rmdir' => ['bool', 'directory'=>'string', 'context='=>'resource'],
-    'round' => ['float', 'num'=>'float', 'precision='=>'int', 'mode='=>'int'],
+    'round' => ['float', 'num'=>'float', 'precision='=>'int', 'mode='=>'0|positive-int'],
     'rpm_close' => ['bool', 'rpmr'=>'resource'],
     'rpm_get_tag' => ['mixed', 'rpmr'=>'resource', 'tagnum'=>'int'],
     'rpm_is_valid' => ['bool', 'filename'=>'string'],

docs/running_psalm/error_levels.md

@@ -187,6 +187,7 @@ These issues are treated as errors at level 3 and below.
  - [PossiblyUndefinedMethod](issues/PossiblyUndefinedMethod.md)
  - [PossiblyUndefinedVariable](issues/PossiblyUndefinedVariable.md)
  - [PropertyTypeCoercion](issues/PropertyTypeCoercion.md)
+ - [RiskyCast](issues/RiskyCast.md)
 
 ## Errors ignored at level 5 and higher
 

docs/running_psalm/issues.md

@@ -214,6 +214,7 @@
  - [RedundantPropertyInitializationCheck](issues/RedundantPropertyInitializationCheck.md)
  - [ReferenceConstraintViolation](issues/ReferenceConstraintViolation.md)
  - [ReservedWord](issues/ReservedWord.md)
+ - [RiskyCast](issues/RiskyCast.md)
  - [StringIncrement](issues/StringIncrement.md)
  - [TaintedCallable](issues/TaintedCallable.md)
  - [TaintedCookie](issues/TaintedCookie.md)

docs/running_psalm/issues/RiskyCast.md

@@ -0,0 +1,17 @@
+# RiskyCast
+
+Emitted when attempting to cast an array to int or float
+
+```php
+<?php
+
+$foo = (int) array( 'hello' );
+```
+
+## Why this is bad
+
+The value resulting from the cast depends on if the array is empty or not and can easily lead to off-by-one errors
+
+## How to fix
+
+Don't cast arrays to int or float.