Merge pull request #56 from jissereitsma/doc-strict-types

Implement doc for rule on Strict Types

Author: Fabian Schmengler /

Extdn/Sniffs/Classes/StrictTypesSniff.md

@@ -0,0 +1,19 @@
+# Rule: Add `declare(strict_types=1)` to your PHP files
+## Background
+With PHP 7, it is possible to add type hinting to your code. However, this doesn't mean that types are actually enforced, unless strict typing is
+enabled by adding `declare(strict_types=1)` to the top of each PHP file. 
+
+## Reasoning
+PHP code becomes more robust when type hinting (argument types, return types) are added. With the `declare(strict_types=1)` added, there is less
+chance for bugs that related to type casting.
+
+## How it works
+This rule scans the source code to see whether a line `declare(strict_type=1)` occurs or not.
+
+## How to fix
+Simply add a statement `declare(strict_types=1)` to the top of your files:
+
+    <?php
+    declare(strict_types=1);
+
+    namespace Foo\Bar;