Updated Classes (markdown)

Classes.md

@@ -77,3 +77,57 @@ class MyClass extends BaseClass {
 </div></details><br>
 
 _Reference_: [`Generic.CodeAnalysis.UselessOverridingMethod`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/Generic/Sniffs/CodeAnalysis/UselessOverridingMethodSniff.php)
+
+# abstract and final declarations MUST precede the visibility declaration
+
+When declaring `abstract` and `final` functions, the visibility (scope) must follow after `abstract` or `final`.
+
+<details><summary>Example</summary><div><br>
+
+**Bad**
+
+```PHP
+class MyClass extends BaseClass {
+    public abstract function AbstractFunction() { }
+    public final function FinalFunction() { }
+}
+```
+
+**Good** (`abstract` and `final` before `public`)
+
+```PHP
+class MyClass extends BaseClass {
+    abstract public function AbstractFunction() { }
+    final public function FinalFunction() { }
+}
+```
+
+</div></details><br>
+
+_Reference_: [`PSR2.Methods.MethodDeclaration`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/PSR2/Sniffs/Methods/MethodDeclarationSniff.php)
+
+# static declaration MUST come after the visibility declaration
+
+The `static` keyword must come after the visibility (scope) parameter.
+
+<details><summary>Example</summary><div><br>
+
+**Bad**
+
+```PHP
+class MyClass extends BaseClass {
+    static public function StaticFunction() { }
+}
+```
+
+**Good** (`static` after `public`)
+
+```PHP
+class MyClass extends BaseClass {
+    public static function StaticFunction() { }
+}
+```
+
+</div></details><br>
+
+_Reference_: [`PSR2.Methods.MethodDeclaration`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/PSR2/Sniffs/Methods/MethodDeclarationSniff.php)