PHP reads configuration file class instances (can read ini, yaml, xml, etc.)_php skills

The example in this article describes an example of PHP reading configuration file class. Share it with everyone for your reference. The details are as follows:

<&#63;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']; 
 } 
} 
&#63;> 

/** 
* 针对PHP的配置,如有配置文件 
*config.php 
<&#63;php 
$db = array(); 
// Enter your database name here: 
$db['name'] = 'test'; 
// Enter the hostname of your MySQL server: 
$db['host'] = 'localhost'; 
&#63;> 
//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 
<&#63;xml version="1.0" encoding="UTF-8"&#63;> 
<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<a href="http://spyc.sourceforge.net//">
/</a>** 
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. Is ini a bit outdated? ?
2. xml is better,
3. Yaml is very good, but it is not standardized after all.
4. txt needs to be formatted by itself, and its openness is not good.
5. Class serialization. It's better, but it's more troublesome for people who are unfamiliar with it!
6. PHP defines constants (don’t you need to modify the data?)

So: xml is best.

I hope this article will be helpful to everyone’s PHP programming design.