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PHP:读取ini xml等配置文件

Jun 06, 2016 pm 08:09 PM
ini php xml develop us hour program read Configuration file

我们在开发程序的时候会经常用到数据存储这一块。一般呢,如果数据不多,我们一般都会选择把数据把数据保存在本地的配置上面。而配置文件最常见到的格式主要有ini xml等几种格式。大家为什么把数据保存在文本类型的文件里面,我也不知道。也许是读取速度上面

我们在开发程序的时候会经常用到数据存储这一块。一般呢,如果数据不多,我们一般都会选择把数据把数据保存在本地的配置上面。而配置文件最常见到的格式主要有ini xml等几种格式。大家为什么把数据保存在文本类型的文件里面,我也不知道。也许是读取速度上面的差异吧。好了,下面我们来看看,PHP怎么从本地的配置文件里面读取数据,并获得自己所需的部分呢。

<?php class Settings {      
    var $_settings = array ();      
    function get($var) {      
        $var = explode ( &#8216;.&#8217;, $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'];      
    }      
}      
?>      
 php   
/**    
* 针对PHP的配置,如有配置文件    
*config.php    
<?php $db = array();    
// Enter your database name here:    
$db['name'] = &#8217;test&#8217;;    
// Enter the hostname of your MySQL server:    
$db['host'] = &#8217;localhost&#8217;;    
?>    
//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在http://hudeyong926.iteye.com/admin/blogs/836048   
/**    
* XML例子:config.xml    
<?xml version=&#8221;1.0&#8243; encoding=&#8221;UTF-8&#8243;?>    
<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,相关链接在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。  
Copy after login

当然了,如果数据庞大,我们就需要借助数据库来保存数据了。为了执行速度,更为了安全……

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