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I ate three cookies 🍪 (v3.40.2) edition

Rule lowercase_static_reference

Class static references self, static and parent MUST be in lower case.

Examples

Example #1

--- Original
+++ New
 <?php
 class Foo extends Bar
 {
     public function baz1()
     {
-        return STATIC::baz2();
+        return static::baz2();
     }

     public function baz2($x)
     {
-        return $x instanceof Self;
+        return $x instanceof self;
     }

-    public function baz3(PaRent $x)
+    public function baz3(parent $x)
     {
         return true;
     }
 }

Example #2

--- Original
+++ New
 <?php
 class Foo extends Bar
 {
-    public function baz(?self $x) : SELF
+    public function baz(?self $x) : self
     {
         return false;
     }
 }

Rule sets

The rule is part of the following rule sets:

Source class

PhpCsFixer\Fixer\Casing\LowercaseStaticReferenceFixer