PHP parse_ini_file() 函数

示例 1：基本用法 - 读取INI文件

假设我们有上面的config.ini文件

<?php
// 解析INI文件（不处理节）
$config = parse_ini_file('config.ini');
if ($config !== false) {
    echo "配置加载成功！\n";
    echo "网站名称: " . $config['site_name'] . "\n";
    echo "调试模式: " . ($config['debug_mode'] ? '开启' : '关闭') . "\n";
    echo "最大连接数: " . $config['max_connections'] . "\n";

    // 打印所有配置
    echo "\n所有配置:\n";
    print_r($config);
} else {
    echo "无法解析INI文件\n";
}
?>

示例 2：处理节（sections）

<?php
// 解析INI文件并处理节
$config = parse_ini_file('config.ini', true);
if ($config !== false) {
    echo "配置加载成功！\n\n";

    // 访问全局设置
    echo "全局设置:\n";
    echo "网站名称: " . $config['site_name'] . "\n";
    echo "调试模式: " . ($config['debug_mode'] ? '开启' : '关闭') . "\n\n";

    // 访问数据库设置
    echo "数据库设置:\n";
    echo "主机: " . $config['database']['host'] . "\n";
    echo "用户名: " . $config['database']['username'] . "\n";
    echo "端口: " . $config['database']['port'] . "\n\n";

    // 访问邮件设置
    echo "邮件设置:\n";
    echo "SMTP主机: " . $config['mail']['smtp_host'] . "\n";
    echo "SMTP端口: " . $config['mail']['smtp_port'] . "\n";

    // 打印完整结构
    echo "\n完整配置结构:\n";
    print_r($config);
} else {
    echo "无法解析INI文件\n";
}
?>

示例 3：使用不同的扫描模式

<?php
// 创建一个测试INI文件
$iniContent = <<<INI
bool_value = true
int_value = 123
float_value = 3.14
string_value = "hello"
null_value = null
INI;

file_put_contents('test.ini', $iniContent);

// 使用不同的扫描模式
echo "INI_SCANNER_NORMAL:\n";
$normal = parse_ini_file('test.ini', false, INI_SCANNER_NORMAL);
print_r($normal);

echo "\nINI_SCANNER_RAW:\n";
$raw = parse_ini_file('test.ini', false, INI_SCANNER_RAW);
print_r($raw);

echo "\nINI_SCANNER_TYPED:\n";
$typed = parse_ini_file('test.ini', false, INI_SCANNER_TYPED);
print_r($typed);

// 检查类型
echo "\n类型检查:\n";
foreach ($typed as $key => $value) {
    echo "$key: " . $value . " (" . gettype($value) . ")\n";
}

// 清理
unlink('test.ini');
?>

示例 4：高级用法 - 配置类

<?php
class Config
{
    private static $instance = null;
    private $config = [];

    private function __construct() {
        // 私有构造函数防止直接实例化
    }

    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function load($filename) {
        if (!file_exists($filename)) {
            throw new Exception("配置文件不存在: $filename");
        }

        $this->config = parse_ini_file($filename, true, INI_SCANNER_TYPED);
        if ($this->config === false) {
            throw new Exception("无法解析配置文件: $filename");
        }
    }

    public function get($key, $section = null) {
        if ($section !== null) {
            return $this->config[$section][$key] ?? null;
        }
        return $this->config[$key] ?? null;
    }

    public function getSection($section) {
        return $this->config[$section] ?? [];
    }

    public function getAll() {
        return $this->config;
    }
}

// 使用配置类
try {
    $config = Config::getInstance();
    $config->load('config.ini');

    echo "数据库主机: " . $config->get('host', 'database') . "\n";
    echo "SMTP主机: " . $config->get('smtp_host', 'mail') . "\n";
    echo "调试模式: " . ($config->get('debug_mode') ? '是' : '否') . "\n";

    // 获取整个数据库配置节
    $dbConfig = $config->getSection('database');
    echo "\n数据库配置:\n";
    print_r($dbConfig);

} catch (Exception $e) {
    echo "配置错误: " . $e->getMessage() . "\n";
}
?>