Add ability to add/subtract arrays

README.md

@@ -60,6 +60,12 @@ $size->add('2G')
 echo $size->asAuto(); // '10.00 GB'
 ```
 
+You may also use `add()` and `subtract()` with an array of values:
+
+```
+$size->add(['50mb', '140mb', '1.2mb']);
+```
+
 ### Number base
 
 The second argument of the constructor is the number base, which accepts either `2` (binary) or `10` (decimal). We use binary by default. To handle sizes in decimal:

src/FileSize.php

@@ -63,13 +63,43 @@ private function sizeToBytes($size)
         return $this->convert($value, $unit, UnitMap::BYTE);
     }
 
+    /**
+     * Add one or many filesizes.
+     *
+     * @param array|string|int $sizes
+     * @return self
+     */
+    public function add($sizes)
+    {
+        foreach ((array) $sizes as $size) {
+            $this->addSize($size);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Subtract one or many filesizes.
+     *
+     * @param array|string|int $sizes
+     * @return self
+     */
+    public function subtract($sizes)
+    {
+        foreach ((array) $sizes as $size) {
+            $this->subtractSize($size);
+        }
+
+        return $this;
+    }
+
     /**
      * Add to this filesize.
      *
      * @param string|int $size Such as '100 MB'
      * @return self
      */
-    public function add($size)
+    private function addSize($size)
     {
         $this->bytes += $this->sizeToBytes($size);
 
@@ -82,7 +112,7 @@ public function add($size)
      * @param string|int $size Such as '100 MB'
      * @return self
      */
-    public function subtract($size)
+    private function subtractSize($size)
     {
         $bytesToSubtract = $this->sizeToBytes($size);
 

tests/FileSizeTest.php

@@ -52,6 +52,17 @@ public function testSubtract()
         $this->assertSame($size->as('B'), 128821248);
     }
 
+    /**
+     * Test adding an array of items.
+     */
+    public function testAddMany()
+    {
+        $size = new FileSize();
+        $size->add(['50mb', '140mb', '1.2mb']);
+
+        $this->assertSame($size->as('MB'), 191.2);
+    }
+
     /**
      * Test #multiplyBy.
      */