## eval ##### Description Evaluate a LUA script serverside 在服務器端執行LUA腳本 ##### Parameters *script* string. *args* array, optional. *num\_keys* int, optional. ##### Return value Mixed. What is returned depends on what the LUA script itself returns, which could be a scalar value (int/string), or an array. Arrays that are returned can also contain other arrays, if that's how it was set up in your LUA script. If there is an error executing the LUA script, the getLastError() function can tell you the message that came back from Redis (e.g. compile error). 這個函數返回的結果是函數傳輸的LUA腳本的執行結果。結果可以是一個普通的數據類型，也可以使一個數組，數組內也可以嵌套數組。無論返回的結果是什么，都是取決于你的LUA腳本是如何執行的。如果你傳輸的LUA腳本存在錯誤，那么getLastError()能夠返回出REDIS對于這個錯誤的具體消息。 ##### Examples ``` <pre class="calibre16">$redis->eval("return 1"); // Returns an integer: 1 $redis->eval("return {1,2,3}"); // Returns Array(1,2,3) $redis->del('mylist'); $redis->rpush('mylist','a'); $redis->rpush('mylist','b'); $redis->rpush('mylist','c'); // Nested response: Array(1,2,3,Array('a','b','c')); $redis->eval("return {1,2,3,redis.call('lrange','mylist',0,-1)}}"); ``` ##