Warning: mysqli::mysqli() [mysqli.mysqli]: [2002] No such file or directory (trying to connect via unix:///var/mysql/mysql.sock) in /Users/user/Sites/promos/index.php on line 8 Warning: mysqli::mysqli() [mysqli.mysqli]: (HY000/2002): No such file or directory in /Users/user/Sites/promos/index.php on line 8 Warning: mysqli::autocommit() [mysqli.autocommit]: Couldn't fetch mysqli in /Users/user/Sites/promos/index.php on line 9 Warning: mysqli::prepare() [mysqli.prepare]: Couldn't fetch mysqli in /Users/user/Sites/promos/index.php on line 20 Fatal error: Call to a member function execute() on a non-object in /Users/user/Sites/promos/index.php on line 21

这些警告和错误信息表明，PHP 脚本无法连接到 MySQL 数据库服务器，可能是因为连接参数设置不正确或 MySQL 服务器没有正确地安装或配置。以下是一些可能的解决方案：

1. 检查连接参数是否正确。在 PHP 代码中，你需要指定 MySQL 服务器的主机名、用户名、密码和数据库名。确保这些参数与你的 MySQL 服务器设置相匹配。

2. 检查 MySQL 服务器是否已正确安装和配置。如果你使用的是本地 MySQL 服务器，在终端中输入以下命令可以检查 MySQL 服务器是否正在运行：

sudo systemctl status mysql

如果 MySQL 服务器没有运行，请键入以下命令以启动它：

sudo systemctl start mysql

如果 MySQL 服务器已经运行，但仍然无法连接，请检查 MySQL 服务器的配置文件是否正确设置。

3. 检查 PHP 模块是否已正确安装和启用。你需要确保 PHP 安装了 mysqli 扩展，因为这是连接 MySQL 数据库服务器所必需的。你可以在 PHP 配置文件中查找 mysqli 扩展是否已启用。

希望这些解决方案可以帮助你解决问题！如果你还有其他问题，请随时向我提问。

相关问题

PHP message: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysql.so' - libmysqlclient.so.16: cannot open shared object file: No such file or directory in Unknown on line 0 [25-May-2023 15:23:47] NOTICE: PHP message: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysqli.so' - libmysqlclient.so.16: cannot open shared object file: No such file or directory in Unknown on line 0 [25-May-2023 15:23:47] NOTICE: PHP message: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so' - libmysqlclient.so.16: cannot open shared object file: No such file or directory in Unknown on line 0

这个错误信息表明 PHP 在启动时无法加载 MySQL 扩展，因为缺少 libmysqlclient.so.16 库文件。你需要安装这个库文件，或者检查它是否已经安装并且路径是否正确配置。可以尝试使用以下命令安装：

sudo yum install mysql-devel

如果已经安装了这个库文件，可以尝试在 php.ini 文件中添加以下内容：

extension=/usr/lib64/php/modules/mysql.so
extension=/usr/lib64/php/modules/mysqli.so
extension=/usr/lib64/php/modules/pdo_mysql.so

然后重启 PHP 服务。

mysqli::real_connect(): (HY000/2002): No such file or directory

This error typically occurs when attempting to connect to a MySQL database using the mysqli extension in PHP, but the specified host or socket file cannot be found.

Here are a few potential solutions:

1. Check the host and port settings in your code. Make sure they match the settings in your MySQL configuration file (my.cnf) or the ones provided by your web host.

2. Check that the MySQL server is running. If it's not running, start it up and try connecting again.

3. Check that the socket file specified in your code exists. If it doesn't exist, update your code to use a different socket file or host/port combination.

4. If you're using a Unix-based system, check that the MySQL socket file is in the correct location. On many systems, this is /var/run/mysqld/mysqld.sock.

5. If you're using a Windows system, make sure that the MySQL service is running and that you've specified the correct host and port in your code.

If none of these solutions work, you may need to consult with a web developer or system administrator to troubleshoot the issue further.