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Found 4 rules:

Add explicit public method visibility

 class SomeClass
 {
-    function foo()
+    public function foo()
     {
     }
 }

SETS: PHP 5.3

Convert dirname(__FILE__) to __DIR__

 class SomeClass
 {
     public function run()
     {
-        return dirname(__FILE__);
+        return __DIR__;
     }
 }

SETS: PHP 5.3

Rename old $HTTP_* variable names to new replacements

-$serverVars = $HTTP_SERVER_VARS;
+$serverVars = $_SERVER;

SETS: PHP 5.3

Use ?: instead of ?, where useful

 function elvis()
 {
-    $value = $a ? $a : false;
+    $value = $a ?: false;
 }

SETS: PHP 5.3