php连接不上数据库

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 8
Server 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 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 5.7.11, for osx10.9 (x86_64) using EditLine wrapper
Connection id: 8
Current database: 
Current user: root@localhost
SSL: Not in use
Current pager: less
Using outfile: ‘‘
Using delimiter: ;
Server version: 5.7.11 MySQL Community Server (GPL)
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: utf8
Db characterset: utf8
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /tmp/mysql.sock
Uptime: 8 days 15 hours 1 min 17 sec
Threads: 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

5.重启nginx或者apache

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