macos下php+mysql不能使用localhost连接的问题解决
因为localhost是通过socket方式来连接，而127.0.0.1则是走的TCP协议。所以需要重新设置php-mysql的配置文件
$echo "show variables" | mysql | grep "socket" socket /opt/local/var/run/mysql5/mysqld.sock $vi /opt/local/var/db/php5/mysql.ini ; Do not edit this file; it is automatically generated by MacPorts. ; Any changes you make will be lost if you upgrade or uninstall php5-mysql. ; To configure PHP, edit /opt/local/etc/php5/php.ini. extension=mysql.so extension=mysqli.so extension=pdo_mysql.so mysql.default_socket= /opt/local/var/run/mysql5/mysqld.sock mysqli.default_socket= /opt/local/var/run/mysql5/mysqld.sock pdo_mysql.default_socket= /opt/local/var/run/mysql5/mysqld.sock
设置mysql.default_socket，mysqli.default_socket，pdo_mysql.default_socket