How to solve the problem that php mysql cannot connect to the database

php The solution to the problem that mysql cannot connect to the database: first obtain the current "mysql.default_socket" and other information; then obtain the MySQL socket path; finally open "php.ini" and modify the values ​​such as "mysql.default_socket" .

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1. Get the current mysql.default_socket, mysqli. default_socket, pdo_mysql.default_socket configuration information

Create a PHP file and display phpinfo():

Open with browser:

On this page, find mysql.default_socket, mysqli.default_socket, pdo_mysql.default_socket information:

##2. Get the MySQL socket path

Enter MySQL through the console, enter the command: STATUS, find the UNIX socket value

#mysql -u root -p
Enter 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 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:        8Current database:    
Current user:        root@localhost
SSL:            Not in use
Current pager:        lessUsing outfile:        ‘‘
Using delimiter:    ;
Server version:        5.7.11 MySQL Community Server (GPL)
Protocol version:    10Connection:        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. At this time, you compare mysql.default_socket, mysqli.default_socket, pdo_mysql.default_socket and find that they are different through MySQL UNIX socket. This is the reason for the mysql_connect(); warning: There is a problem with PHP configuring mysql.

4. Reconfigure PHP, open php.iniModify the values ​​of mysql.default_socket, mysqli.default_socket, and pdo_mysql.default_socket to: /tmp/mysql.sock

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

Or modify the socket of my.cnf:

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

5. Restart nginx or apache

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