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);

?>

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