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/**
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。