php mysql連接不上資料庫的解決方法：先取得目前「mysql.default_socket」等資訊；然後取得MySQL socket路徑；最後開啟「php.ini」修改「mysql.default_socket」等值即可。
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1. 取得目前 mysql.default_socket、mysqli. default_socket、pdo_mysql.default_socket 設定資訊
#建立一個PHP 檔案, 顯示phpinfo():
用瀏覽器開啟:
在此頁面，找到mysql.default_socket、mysqli.default_socket、pdo_mysql.default_socket信息:
2. 取得MySQL socket 路徑
透過控制台進入MySQL, 輸入指令: STATUS, 找出UNIX socket 值
#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. 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, 這就是為什麼#mysql_connect();
#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
[client] socket=/tmp/mysql.sock [mysqld] socket=/tmp/mysql.sock
#5.重啟nginx或apache
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