如何解決php連接不上數據庫的問題

這篇文章將為大家詳細講解有關如何解決php連接不上數據庫的問題，小編覺得挺實用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。

PHP連接不上MySQL解決方案總結

1. 獲取當前 mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 配置信息

建立一個 PHP 文件, 顯示 phpinfo():

用瀏覽器打開:

在此頁面，找到mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket信息:

2. 獲取 MySQL socket 路徑

通過控制臺進入 MySQL, 輸入命令: 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. 這時候, 你對比 mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 和 通過 MySQL UNIX socket 發現不一樣, 這就是 mysql_connect(); 警告的原因: PHP 配置 mysql 有問題.

4. 重新配置 PHP, 打開php.ini修改mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 的值為: /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.重啟nginx或者apache

關于如何解決php連接不上數據庫的問題就分享到這里了，希望以上內容可以對大家有一定的幫助，可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。