Examples of PHP reading four configuration files (php, ini, yaml, xml)

Examples of PHP reading four configuration files (php, ini, yaml, xml). The code is as follows. Take a look at it for yourself. You may be able to use it one day.

/**
* Read the table information configured in 4, now supports php.ini, xml.yaml
*/
class Settings{
var $_settings = array();
/**
 * Get the value of some settings
 *
 * @param unknown_type $var
 * @return unknown
*/
       function get($var) {
         $var = explode('.', $var);
         $result = $this->_settings;
         foreach ($var as $key) {
                   if (!isset($result[$key])) { return false; }
                   $result = $result[$key];
         }
         return $result;
        // trigger_error ('Not yet implemented', E_USER_ERROR);//引发一个错误
       }
       function load() {
            trigger_error ('Not yet implemented', E_USER_ERROR);
       }
}
/**
* For PHP configuration, if there is a configuration file
* $file=

$db = array();
// Enter your database name here:
$db ['name'] = 'test';
// Enter the hostname of your MySQL server:
$db['host'] = 'localhost';
< ;p>?>
Specific call:
include ('settings.php'); //The original environment assumes that each class is a separate class name .php file
// Load settings (PHP)
$settings = new Settings_PHP;
$settings->load('config.php');
echo 'PHP: ' . $settings->get('db.host') . '';
*
*/
Class Settings_PHP Extends Settings {
function load ($file) {
         if (file_exists($file) == false) { return false; }
         // Include file
         include ($file);
unset($file);   //销毁指定变量
$vars = get_defined_vars(); //返回所有已定义变量的列表,数组,变量包括服务器等相关变量,
//通过foreach吧$file引入的变量给添加到$_settings这个成员数组中去.
foreach ($vars as $key => $val) {
         if ($key == 'this') continue;
         $this->_settings[$key] = $val;
}
}
}
//////////////////////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 example:
* [db]
name = test
host = localhost
Call example:
$settings = new Settings_INI;
$settings->load('config.ini');
echo 'INI: ' . $settings->get('db.host') . '';
*
*/
Class Settings_INI Extends Settings {
function load ($file) {
         if (file_exists($file) == false) { return false; }
         $this->_settings = parse_ini_file ($file, true);
}
}
//////////////////////读取XML文件,需要用到XML_PARSER////////////////////////
/**
* XML例子:



                   test
                   localhost


调用例子:
// Load settings (XML)
$settings = New Settings_XML;
$settings->load('config.xml');
echo 'XML: ' . $settings->get('db.host') . '';
*
*/
Class Settings_XML Extends Settings {
function load ($file) {
       if (file_exists($file) == false) { return false; }
       /**xmllib.php is PHP XML Library, version 1.2b, related link: http://keithdevens.com/software/phpxml
 The main feature of xmllib.php is to convert an array into an xml or convert xml into an array
 XML_unserialize: Convert an xml into an array
 XML_serialize: Convert an array into an xml
 Since PHP5, simpleXML is very good, but it still does not support the function of converting xml into an array, so xmlLIB is still very good.
*/
       include ('xmllib.php');
       $xml = file_get_contents($file);
       $data = XML_unserialize($xml);
       $this->_settings = $data['settings'];
}
}
////////////////////////////////////Read YAML format files////////// //////////////////////////////////////
/**
To use YAML, you must use the SPYC library. The relevant link is at http://spyc.sourceforge.net/
YAML configuration example:
db:
 name: test
 host: localhost
*/
Class Settings_YAML Extends Settings {
function load ($file) {
 if (file_exists($file) == false) { return false; }
 include ('spyc.php');
 $this- >_settings = Spyc::YAMLLoad($file);
}
}