php INI配置文件的解析实现分析_php技巧
所以看到这篇文章的时候，我也才刚刚知道，原来，还有一个dba的函数可以用，嗯，仔细看了一下dba这个函数的installtion，发现支持inifile也是从PHP5才开始实现的。好吧，相应的dba相关的可以看看这里：http://www.php.net/manual/en/dba.installation.php，详细的还是看这里吧：http://www.php.net/manual/en/book.dba.php
OK，上原文，它来自于：http://www.cardii.net/php-spl-parse-ini-file/。
曾经介绍过SPL的各类型接口和迭代器。今天，在浏览PHP源码目录时，发现有个解析INI文件的例子，觉得不错，于是整理了一个实例，拿来分享下。
在PHP应用程序中，配置文件不可或缺，特别是商城，CMS之类的产品，不同的客户需求不同，当然，不会每个客户开发一套程序，好办法的是每个客户 有一套不同的配置文件。适合做配置文件的我曾经也说过，主要有四类：PHP数组（几乎其他的配置方法最终都是解析成为PHP数组），XML,YAML和 INI。今天只讲INI文件。ZendFramework使用此配置。
下看个DbaReader类。文件名为 DbaReader.php：
class DbaReader implements Iterator
{
protected $db = NULL;
private $key = false;
private $val = false;
/**
* Open database $file with $handler in read only mode.
*
* @param file Database file to open.
* @param handler Handler to use for database access.
*/
function __construct($file, $handler) {
if (!$this->db = dba_open($file, 'r', $handler)) {
throw new exception('Could not open file ' . $file);
}
}
/**
* Close database.
*/
function __destruct() {
dba_close($this->db);
}
/**
* Rewind to first element.
*/
function rewind() {
$this->key = dba_firstkey($this->db);
$this->fetch_data();
}
/**
* Move to next element.
*
* @return void
*/
function next() {
$this->key = dba_nextkey($this->db);
$this->fetch_data();
}
/**
* Fetches the current data if $key is valid
*/
private function fetch_data() {
if ($this->key !== false) {
$this->val = dba_fetch($this->key, $this->db);
}
}
/**
* @return Current data.
*/
function current() {
return $this->val;
}
/**
* @return Whether more elements are available.
*/
function valid() {
if ($this->db && $this->key !== false) {
return true;
} else {
return false;
}
}
/**
* @return Current key.
*/
function key() {
return $this->key;
}
}
?>
DbaReader使用Iterator接口，当然要实现里面的5个迭代方法。迭代方法对handlerhandlerINI文件的解析，用到了dba扩展。
说点题外话，什么是Dba？为什么使用Dba？
Dba是一款数据库，确切点说，是一款索引化的文件存储系统。适合相对比较静态的索引化的数据存储。所有版本的Linux都会带此数据库。
既然使用文件来存储数据，为什么还有使用Dba呢？原因有二：
１数据记录的存储长度可以不是固定的；
２使用索引存储和检索数据。
DbaReader提供一个访问INI文件数据的迭代方法，如果需要存储删除数据呢？所以DbaArray在继承DbaReader的基础上，实现了此功能。
class DbaArray extends DbaReader implements ArrayAccess
{
/**
* Open database $file with $handler in read only mode.
*
* @param file Database file to open.
* @param handler Handler to use for database access.取值http://www.php.net/manual/en/dba.requirements.php
*/
function __construct($file, $handler)
{
$this->db = dba_popen($file, "c", $handler);
if (!$this->db) {
throw new exception("Databse could not be opened");
}
}
/**
* Close database.
*/
function __destruct()
{
parent::__destruct();
}
/**
* Read an entry.
*
* @param $name key to read from
* @return value associated with $name
*/
function offsetGet($name)
{
$data = dba_fetch($name, $this->db);
if($data) {
if (ini_get('magic_quotes_runtime')) {
$data = stripslashes($data);
}
//return unserialize($data);
return $data;
}
else
{
return NULL;
}
}
/**
* Set an entry.
*
* @param $name key to write to
* @param $value value to write
*/
function offsetSet($name, $value)
{
//dba_replace($name, serialize($value), $this->db);
dba_replace($name, $value, $this->db);
return $value;
}
/**
* @return whether key $name exists.
*/
function offsetExists($name)
{
return dba_exists($name, $this->db);
}
/**
* Delete a key/value pair.
*
* @param $name key to delete.
*/
function offsetUnset($name)
{
return dba_delete($name, $this->db);
}
}
?>
使用范例
构建文件text.ini,内容如下：
host = localhost
password = password
database = data
文件index.php.代码如下：
function loadClass($class)
{
require_once __DIR__.DIRECTORY_SEPARATOR.$class.'.php';
}
spl_autoload_register('loadClass',false);
$iniFile = __DIR__.DIRECTORY_SEPARATOR.'test.ini';
$ini = new DbaArray($iniFile,'iniFile');
echo $ini['database'];
var_dump($ini);
?>
--EOF--
看完上面这一段，是不是有什么想法？原来ini的操作也是这么的方便？不过，如果是纯读取的话，我还是比较推荐于parse_ini_file之类的（突然间忘了，如果编码不一样怎么办？ansi/utf-8，这真是一个永恒的痛。）
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