一文详解php中.env实现原理

// 读取.env文件内容
$contents = file_get_contents('.env');

// 将文件内容按行分割成数组
$lines = explode("\n", $contents);

// 遍历每一行
foreach ($lines as $line) {
    // 忽略空行和注释行
    if (empty($line) || strpos($line, '#') === 0) {
        continue;
    }
    
    // 解析键值对
    list($key, $value) = explode('=', $line, 2);
    
    // 去除键和值两端的空格
    $key = trim($key);
    $value = trim($value);
    
    // 将变量设置为环境变量
    putenv("$key=$value");
}

// 示例：访问环境变量
$databaseHost = getenv('DB_HOST');
$databaseName = getenv('DB_NAME');
$databaseUser = getenv('DB_USER');
$databasePassword = getenv('DB_PASSWORD');

// 输出环境变量的值
echo "Database Host: $databaseHost\n";
echo "Database Name: $databaseName\n";
echo "Database User: $databaseUser\n";
echo "Database Password: $databasePassword\n";