PHP读取配置文件类实例(可读取ini,yaml,xml等)

本文实例讲述了PHP读取配置文件类实例。分享给大家供大家参考。具体如下：

    <?php 
    class Settings { 
     var $_settings = array (); 
     function get($var) { 
     $var = explode ( '.', $var ); 
     $result = $this->_settings; 
     foreach ( $var as $key ) { 
      if (! isset ( $result [$key] )) { 
      return false; 
      }  
      $result = $result [$key]; 
     }  
     return $result; 
     } 
     function load() { 
     trigger_error ( 'Not yet implemented', E_USER_ERROR ); 
     } 
    } 
    class Settings_PHP extends Settings { 
     function load($file) { 
     if (file_exists ( $file ) == false) { 
      return false; 
     } 
     // Include file 
     include ($file); 
     unset ( $file ); 
     // Get declared variables 
     $vars = get_defined_vars (); 
     // Add to settings array 
     foreach ( $vars as $key => $val ) { 
      if ($key == 'this') 
      continue;  
      $this->_settings [$key] = $val; 
     } 
     } 
    } 
    class Settings_INI extends Settings { 
     function load($file) { 
     if (file_exists ( $file ) == false) { 
      return false; 
     } 
     $this->_settings = parse_ini_file ( $file, true ); 
     } 
    } 
    class Settings_YAML extends Settings { 
     function load($file) { 
     if (file_exists ( $file ) == false) { 
      return false; 
     } 
     include ('spyc.php'); 
     $this->_settings = Spyc::YAMLLoad ( $file ); 
     } 
    } 
    class Settings_XML extends Settings { 
     function load($file) { 
     if (file_exists ( $file ) == false) { 
      return false; 
     } 
     include ('xmllib.php'); 
     $xml = file_get_contents ( $file ); 
     $data = XML_unserialize ( $xml ); 
     $this->_settings = $data ['settings']; 
     } 
    } 
    ?> 

    /** 
    * 针对PHP的配置,如有配置文件 
    *config.php 
    <?php 
    $db = array(); 
    // Enter your database name here: 
    $db['name'] = 'test'; 
    // Enter the hostname of your MySQL server: 
    $db['host'] = 'localhost'; 
    ?> 
    //具体调用: 
    include ('settings.php'); //原始环境假设每个类为单独的一个类名.php文件 
    // Load settings (PHP) 
    $settings = new Settings_PHP; 
    $settings->load('config.php'); 
    echo 'PHP: ' . $settings->get('db.host') . ''; 
    * 
    */ 
     读取INI文件,主要用到parser_ini_file函数,该函数返回一个数组,如第二个参数为true时则返回多维数组
    /** 
    * ini例子:config.ini 
    * 
    [db] 
    name = test 
    host = localhost 
    //调用例子: 
    $settings = new Settings_INI; 
    $settings->load('config.ini'); 
    echo 'INI: ' . $settings->get('db.host') . ''; 
    */ 
     读取XML文件,需要用到XML_PARSER，xmllib.php
    /** 
    * XML例子:config.xml 
    <?xml version="1.0" encoding="UTF-8"?> 
    <settings> 
    <db> 
     <name>test</name> 
     <host>localhost</host> 
    </db> 
    </settings> 
    // Load settings (XML) 
    $settings = New Settings_XML; 
    $settings->load('config.xml'); 
    echo 'XML: ' . $settings->get('db.host') . ''; 
    * 
    */ 
     读取YAML格式文件,使用YAML必须使用到SPYC这个库[
    /](http://spyc.sourceforge.net//)** 
    YAML配置例子:config.yaml 
    db: 
     name: test 
     host: localhost 
    // Load settings (YAML) 
    $settings = New Settings_YAML; 
    $settings->load('config.yaml'); 
    echo 'YAML: ' . $settings->get('db.host') . ''; 
    */ 

1. ini有点过时？？
2. xml比较好，
3. yaml很好，但是毕竟没有标准化。
4. txt要自己组织格式，开放性不好。
5. 类序列化。比较好，但是不熟悉的人使用比较麻烦！
6. php定义常量（你不用修改数据吗？）

所以：xml最好。

希望本文所述对大家的php程序设计有所帮助。