PHP 警告:mysqli::__construct(): (HY000/2002): 没有这样的文件或目录 (Debian GNU/Linux 9)

2022-01-24 00:00:00 cron command-line debian php mysqli

我在 Debian 9、Apache 2.4、PHP 7.2 上运行我的网站.MySQL 数据库是远程的.该网站使用 mysqli 模块运行顺畅.但是当我尝试通过命令行运行 PHP 文件时，它会失败并显示错误:

I run my website on Debian 9, Apache 2.4, PHP 7.2. MySQL database is remote. The website works smoothly using mysqli module. But when I try to run PHP file through command line it fails and displays the error:

PHP 警告:mysqli::__construct(): (HY000/2002): No such file or directory in ...数据库连接失败:没有这样的文件或目录 (2002)

PHP Warning: mysqli::__construct(): (HY000/2002): No such file or directory in ... Database connection failed: No such file or directory (2002)

我一直在尝试运行的 PHP 文件开头有这一行:

The PHP file I've been trying to run has this line in the beginning:

require_once(__DIR__ . '/../private/initialize.php');

initialize.php 文件有这一行:$database = db_connect();，它调用了这些函数:

The initialize.php file has this line: $database = db_connect();, which calls these functions:

function db_connect() {
    $connection = new mysqli(DB_SERVER, DB_USER, DB_PASS, DB_NAME);
    confirm_db_connect($connection);
    return $connection;
}

function confirm_db_connect($connection) {
    if ($connection->connect_errno) {
        $msg = 'Database connection failed: ';
        $msg .= $connection->connect_error;
        $msg .= ' (' . $connection->connect_errno . ')';
        exit($msg);
    }
}

出于安全原因，数据库凭据设置为常量，并通过以下代码从环境变量中获取:

For security reasons database credentials is set as constants and is taken from environmental variables by the following code:

define('DB_SERVER', getenv('DB_SERVER'));
define('DB_USER', getenv('DB_USER'));
define('DB_PASS', getenv('DB_PASS'));
define('DB_NAME', getenv('DB_NAME'));

通过export命令在/etc/apache2/envvars文件中定义的环境变量:

Environmental variables defined in /etc/apache2/envvars file through export command:

export DB_SERVER='*here db credential*'
export DB_USER='*here db credential*'
export DB_PASS='*here db credential*'
export DB_NAME='*here db credential*'

我检查了脚本是否正在使用环境变量，但它们没有.

I have checked whether the environmental variables are being taken by the script and they weren't.

echo getenv('DB_SERVER');
echo getenv('DB_USER');
echo getenv('DB_PASS');
echo getenv('DB_NAME');

好像是变量设置不当.

有人可以帮忙解决这个问题吗?我想从命令行运行带有 mysqli 扩展名的 PHP 文件，以便使用 CRON 作业.

Can anybody help with the issue? I want to run PHP files with mysqli extension from command line so that to use CRON Jobs.

提前致谢！

推荐答案

我解决了这个问题！

我在 cron 作业之前将变量放入 crontab -e 文件中，但没有 export 命令.

I placed my variables into crontab -e file before cron jobs but without export command.

DB_SERVER='*here db credential*'
DB_USER='*here db credential*'
DB_PASS='*here db credential*'
DB_NAME='*here db credential*'

它使所有 cron 作业都可以访问变量.

It makes the variables accessible for all cron jobs.

所以当我使用 cron 作业时它工作得很好！

So when I am using cron jobs it works just fine!

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