mac 报如下错误：
[sun sep 06 23:44:10.162087 2015] [:error] [pid 1004] [client 127.0.0.1:52136] php fatal error:  uncaught exception 'pdoexception' with message 'sqlstate[hy000] [2002] no such file or directory' in /users/yuan/www/phpems/lib/pepdo.cls.php:23\nstack trace:\n#0 /users/yuan/www/phpems/lib/pepdo.cls.php(23): pdo->__construct('mysql:host=loca...', 'root', 'db10056')\n#1 /users/yuan/www/phpems/lib/pepdo.cls.php(90): pepdo->connect()\n#2 /users/yuan/www/phpems/lib/session.cls.php(86): pepdo->fetch(array)\n#3 /users/yuan/www/phpems/lib/session.cls.php(31): session->getsessionvalue('443cd730d32899e...')\n#4 /users/yuan/www/phpems/lib/session.cls.php(17): session->getsessionid()\n#5 /users/yuan/www/phpems/lib/init.cls.php(79): session->__construct(object(ginkgo))\n#6 /users/yuan/www/phpems/app/content/app.php(19): ginkgo->make('session')\n#7 /users/yuan/www/phpems/lib/init.cls.php(133): app->__construct(object(ginkgo))\n#8 /users/yuan/www/phpems/index.php(7): ginkgo->run()\n#9 {main}\n  thrown in /users/yuan/www/phpems/lib/pepdo.cls.php on line 23
自己的解决方案如下：
1:拷贝一份php.ini文件
   cd  /private/etc/
   sudo  cp php.ini.default  php.ini
   sudo  vi  php.ini
2: 修改php.ini中的所有的default_socket都改成/tmp/mysql.sock   (我的mysql的sock在tmp中)。