Add Carbon::quarter_string

src/Carbon.php

@@ -15,10 +15,13 @@ class Carbon extends CarbonBase
 
     public function __get($name)
     {
-       switch (true) {
-            case $name === 'half':
+       switch ($name) {
+            case 'half':
                 return (int) ceil($this->month / static::MONTHS_PER_HALF);
 
+	       case 'quarter_string':
+		       return sprintf('%dQ%d',$this->year,$this->quarter);
+
             default:
                 return parent::__get($name);
        }