adding zip helper

Readme.md

@@ -0,0 +1,7 @@
+# Usage
+
+    // do not overwrite if file exists
+    $this->Zip->create($pathToZipFile, $arrayOfFileLocations, false);
+
+    // overwrite if file exists
+    $this->Zip->create($pathToZipFile, $arrayOfFileLocations, true);

zip.php

@@ -0,0 +1,35 @@
+<?php
+class ZipHelper extends AppHelper {
+  public function create($destination = '', $files = array(), $overwrite = false) {
+    if (file_exists($destination) && !$overwrite) {
+      return false;
+    }
+
+    $validFiles = array();
+    if (is_array($files)) {
+      foreach ($files as $file) {
+        if (file_exists($file)) {
+          $validFiles[] = $file;
+        }
+      }
+    }
+
+    if (count($validFiles) < 1) {
+      return false;
+    }
+
+    $zip = new ZipArchive();
+    $type = $overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE;
+    if ($zip->open($destination, $type) !== true) {
+      return false;
+    }
+
+    $dest = str_replace('.zip', '', basename($destination));
+    foreach ($validFiles as $file) {
+      $zip->addFile($file, $dest . DS . basename($file));
+    }
+    $zip->close();
+
+    return file_exists($destination);
+  }
+}