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。

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