--- /dev/null
+<?php
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+namespace Thrift\StringFunc;
+
+class Core implements TStringFunc
+{
+ public function substr($str, $start, $length = null)
+ {
+ // specifying a null $length would return an empty string
+ if ($length === null) {
+ return substr($str, $start);
+ }
+
+ return substr($str, $start, $length);
+ }
+
+ public function strlen($str)
+ {
+ return strlen($str);
+ }
+}