## lInsert ##### *Description* Insert value in the list before or after the pivot value. the parameter options specify the position of the insert (before or after). If the list didn't exists, or the pivot didn't exists, the value is not inserted. 在指定LIST中的指定中樞VALUE的左側或者右側插入VALUE。如果這個LIST不存在，或者這個pivot(key position)不存在，那么這個VALUE不會被插入。 ##### *Parameters* *key* *position* Redis::BEFORE | Redis::AFTER *pivot* *value* ##### *Return value* The number of the elements in the list, -1 if the pivot didn't exists. ##### *Example* ``` <pre class="calibre16">$redis->delete('key1'); $redis->lInsert('key1', Redis::AFTER, 'A', 'X'); /* 0 */ $redis->lPush('key1', 'A'); $redis->lPush('key1', 'B'); $redis->lPush('key1', 'C'); $redis->lInsert('key1', Redis::BEFORE, 'C', 'X'); /* 4 */ $redis->lRange('key1', 0, -1); /* array('A', 'B', 'X', 'C') */ $redis->lInsert('key1', Redis::AFTER, 'C', 'Y'); /* 5 */ $redis->lRange('key1', 0, -1); /* array('A', 'B', 'X', 'C', 'Y') */ $redis->lInsert('key1', Redis::AFTER, 'W', 'value'); /* -1 */ ```