thinkphp3.1.3 内存问题

Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 35 bytes) inE:\wamp\huike\ThinkPHP\Common\common.php on line 650

<?php

ini_set("memory_limit","12M");

//echo ini_get('display_errors');

define('APP_NAME','Index');//项目名称，非整个网站项目，此处是前台项目名称

define('APP_PATH','./Index/');//前端项目路径

define('RUNTIME_PATH','./Index/indexruntime/');//

require_once './ThinkPHP/ThinkPHP.php';

//echo C('username');

//define('APP_DEBUG',TRUE);

?>

添加 

ini_set("memory_limit","12M");