1、获取当前 mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 配置信息

建立一个 PHP 文件, 显示 phpinfo():

用浏览器打开:

在此页面，找到mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket信息:

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2、获取 MySQL socket 路径

通过控制台进入 MySQL, 输入命令: STATUS, 查找 UNIX socket 值

#mysql -u root -pEnter password: Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 8Server version: 5.7.11 MySQL Community Server (GPL)Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> STATUS--------------mysql  Ver 14.14 Distrib 5.7.11, for osx10.9 (x86_64) using  EditLine wrapperConnection id:        8Current database:    Current user:        root@localhostSSL:            Not in useCurrent pager:        lessUsing ｏｕｔｆｉｌｅ:        ‘‘Using ｄｅｌｉｍｉｔｅｒ:    ;Server version:        5.7.11 MySQL Community Server (GPL)Protocol version:    10Connection:        Localhost via UNIX socketServer characterset:    utf8Db     characterset:    utf8Client characterset:    utf8Conn.  characterset:    utf8UNIX socket:        /tmp/mysql.sockUptime:            8 days 15 hours 1 min 17 secThreads: 2  Questions: 21  Slow queries: 0  Opens: 114  Flush tables: 1  Open tables: 0  Queries per second avg: 0.000--------------

3、这时候, 你对比 mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 和 通过 MySQL UNIX socket 发现不一样, 这就是 mysql_connect(); 警告的原因: PHP 配置 mysql 有问题.

4、重新配置 PHP, 打开php.ini修改mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 的值为: /tmp/mysql.sock

pdo_mysql.default_socket=/tmp/mysql.sock  mysql.default_socket=/tmp/mysql.sock  mysqli.default_socket=/tmp/mysql.sock

或者修改my.cnf的socket：

[client]  socket=/tmp/mysql.sock    [mysqld]  socket=/tmp/mysql.sock

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