PHP连接不上MySQL解决方案总结

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:

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 -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.7. MySQL Community Server (GPL)

Copyright (c) , , Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql> STATUS
--------------
mysql  Ver 14.14 Distrib 5.7., for osx10. (x86_64) using  EditLine wrapper

Connection id:
Current database:
Current user:        root@localhost
SSL:            Not in use
Current pager:        less
Using outfile:        ‘‘
Using delimiter:    ;
Server version:        5.7. MySQL Community Server (GPL)
Protocol version:
Connection:        Localhost via UNIX socket
Server characterset:    utf8
Db     characterset:    utf8
Client characterset:    utf8
Conn.  characterset:    utf8
UNIX socket:        /tmp/mysql.sock
Uptime:             days  hours  min  sec

Threads:   Questions:   Slow queries:   Opens:   Flush tables:   Open tables:   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 

5.重启nginx或者apache