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                ## lSize ##### *Description* Returns the size of a list identified by Key. If the list didn't exist or is empty, the command returns 0. If the data type identified by Key is not a list, the command return `<span class="calibre12">FALSE</span>`. 根據KEY返回該KEY代表的LIST的長度,如果這個LIST不存在或者為空,那么ISIZE返回0,如果指定的KEY的數據類型不是LIST或者不為空,那么返回FALSE。所以在這里多說一句,當用ISize返回判斷值的時候,===就有用處了,這里FLASE和0是兩個概念了。 ##### *Parameters* *Key* ##### *Return value* *LONG* The size of the list identified by Key exists. 如果KEY存在并且為LIST且有元素,那么返回KEY的長度,為空或者不存在返回0。 *BOOL*`<span class="calibre12">FALSE</span>` if the data type identified by Key is not list 如果KEY的數據類型不為空或者LIST,則返回FALSE。 ##### *Example* ``` <pre class="calibre9">$redis->rPush('key1', 'A'); $redis->rPush('key1', 'B'); $redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */ $redis->lSize('key1');/* 3 */ $redis->rPop('key1'); $redis->lSize('key1');/* 2 */ ```
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