Merge pull request #92 from grasmash/issue-38-array-to-string

Fixes #38: Multiple packages using the same patch throws an array to string exception.

src/Patches.php

@@ -171,7 +171,7 @@ public function gatherPatches(PackageEvent $event) {
               }
             }
           }
-          $this->patches = array_merge_recursive($this->patches, $extra['patches']);
+          $this->patches = $this->arrayMergeRecursiveDistinct($this->patches, $extra['patches']);
         }
         // Unset installed patches for this package
         if(isset($this->installedPatches[$package->getName()])) {
@@ -456,4 +456,36 @@ protected function executeCommand($cmd) {
     }
     return ($this->executor->execute($command, $output) == 0);
   }
+
+  /**
+   * Recursively merge arrays without changing data types of values.
+   *
+   * Does not change the data types of the values in the arrays. Matching keys'
+   * values in the second array overwrite those in the first array, as is the
+   * case with array_merge.
+   *
+   * @param array $array1
+   *   The first array.
+   * @param array $array2
+   *   The second array.
+   * @return array
+   *   The merged array.
+   *
+   * @see http://php.net/manual/en/function.array-merge-recursive.php#92195
+   */
+  protected function arrayMergeRecursiveDistinct(array $array1, array $array2) {
+    $merged = $array1;
+
+    foreach ($array2 as $key => &$value) {
+      if (is_array($value) && isset($merged[$key]) && is_array($merged[$key])) {
+        $merged[$key] = $this->arrayMergeRecursiveDistinct($merged[$key], $value);
+      }
+      else {
+        $merged[$key] = $value;
+      }
+    }
+
+    return $merged;
+  }
+
 }