## setRange ##### *Description* Changes a substring of a larger string. 修改字符串的一部分。 ##### *Parameters* *key* *offset* *value* ##### *Return value* *STRING*: the length of the string after it was modified. ##### *Example* ``` <pre class="calibre9">$redis->set('key', 'Hello world'); $redis->setRange('key', 6, "redis"); /* returns 11 */ $redis->get('key'); /* "Hello redis" */ ``` ##