implemented basic SoapKernel to transform a SoapRequest to a SoapResponse

Util/String.php

@@ -0,0 +1,51 @@
+<?php
+/*
+ * This file is part of the WebServiceBundle.
+ *
+ * (c) Christian Kerl <christian-kerl@web.de>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Bundle\WebServiceBundle\Util;
+
+/**
+ * String provides utility methods for strings.
+ *
+ * @author Christian Kerl <christian-kerl@web.de>
+ */
+class String
+{
+  /**
+   * Checks if a string starts with a given string.
+   *
+   * @param  string $str    A string
+   * @param  string $substr A string to check against
+   *
+   * @return bool           True if str starts with substr
+   */
+  public static function startsWith($str, $substr)
+  {
+    if(is_string($str) && is_string($substr) && strlen($str) >= strlen($substr))
+    {
+      return $substr == substr($str, 0, strlen($substr));
+    }
+  }
+
+  /**
+   * Checks if a string ends with a given string.
+   *
+   * @param  string $str    A string
+   * @param  string $substr A string to check against
+   *
+   * @return bool           True if str ends with substr
+   */
+  public static function endsWith($str, $substr)
+  {
+    if(is_string($str) && is_string($substr) && strlen($str) >= strlen($substr))
+    {
+      return $substr == substr($str, strlen($str) - strlen($substr));
+    }
+  }
+}