PHP無法連接資料庫的解決方法總結：
1、取得目前 mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 設定資訊
建立PHP 文件，顯示phpinfo()，用瀏覽器開啟如圖:
在此頁面，找到mysql.default_socket、mysqli.default_socket 、pdo_mysql.default_socket資訊
2、取得MySQL socket 路徑
透過控制台進入MySQL, 輸入指令: STATUS, 尋找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, 你比較 mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket 和透過 MySQL UNIX socket 發現不一樣、default_socket 和透過 MySQL UNIX socket 發現不一樣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
或修改my.cnf的socket：
[client] socket=/tmp/mysql.sock [mysqld] socket=/tmp/mysql.sock
5、重啟nginx或apache
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