基本满足所有配置相关的需求。
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/**
* 解析.ini格式的配置文件为一个树形结构的对象
* 配置文件不同section通过冒号继承
* 默认根据hostname确定使用的section，如果不能确定就优先使用production
* 检测环境的时候总是优先检测production，其余section按定义顺序检测
*
* @author ares@phpdr.net
*
*/
class Config {
/**
* 解析后的配置文件
*
* @var stdClass
*/
private $config;
/**
* 一个二维数组，键是配置文件的section
* 值是一个数组或回调函数
* 如果是数组则计算hostname是否在数组中决定是否使用该section
* 如果是回调函数通过返回值true或false来确定是否使用该section
*
* @var array
*/
private $map = array ();
/**
* section会被解析，:表示继承
* 配置项中的'.'用来区分层级关系
* section中的'.'不会被解析，配置中的数组不受影响。
*
* @param string $conf
* @throws ErrorException
* @return stdClass
*/
function __construct($conf, $map) {
$config = $this->parseIni ( ( object ) parse_ini_string ( $conf, true ) );
if (array_key_exists ( 'production', $map )) {
$production = $map ['production'];
unset ( $map ['production'] );
$map = array_merge ( array (
'production' => $production ), $map );
} else {
throw new ErrorException ( 'production section not found in config' );
}
$section = 'production';
$hostname = gethostname ();
foreach ( $map as $k => $v ) {
if (is_array ( $v )) {
foreach ( $v as $v1 ) {
if ($v1 == $hostname) {
$section = $k;
break 2;
}
}
} elseif (is_callable ( $v )) {
if (true == call_user_func ( $v )) {
$section = $k;
break;
}
} else {
throw new ErrorException ( 'Wrong map value in ' . __CLASS__ );
}
}
$this->config = $config->$section;
}
/**
* 总是返回配置对象
*
* @return mixed
*/
function __get($key) {
if (isset ( $this->config->$key )) {
return $this->config->$key;
}
}
/**
* 切分
*
* @param stdClass $v
* @param string $k1
* @param mixed $v1
*/
private function split($v, $k1, $v1) {
$keys = explode ( '.', $k1 );
$last = array_pop ( $keys );
$node = $v;
foreach ( $keys as $v2 ) {
if (! isset ( $node->$v2 )) {
$node->$v2 = new stdClass ();
}
$node = $node->$v2;
}
$node->$last = $v1;
if (count ( $keys ) > 0) {
unset ( $v->$k1 );
}
}
/**
* parseIni
*
* @param object $conf
* @return stdClass
*/
private function parseIni($conf) {
$confObj = new stdClass ();
foreach ( $conf as $k => $v ) {
// 是section
if (is_array ( $v )) {
$confObj->$k = ( object ) $v;
foreach ( $v as $k1 => $v1 ) {
call_user_func ( array (
$this,
'split' ), $confObj->$k, $k1, $v1 );
}
} else {
call_user_func ( array (
$this,
'split' ), $confObj, $k, $v );
}
}
unset ( $conf );
// 处理继承
foreach ( $confObj as $k => $v ) {
if (false !== strpos ( $k, ':' )) {
if (0 === strpos ( $k, ':' )) {
throw new ErrorException ( 'config ' . $k . ' is invalid, ':' can't be the first char' );
} elseif (1 < substr_count ( $k, ':' )) {
throw new ErrorException ( 'config ' . $k . ' is invalid, ':' can appear only once' );
} else {
$keys = explode ( ':', $k );
if (! isset ( $confObj->$keys [1] )) {
throw new ErrorException ( 'parent section ' . $keys [1] . ' doesn't exist in config file' );
} else {
if (isset ( $confObj->$keys [0] )) {
throw new ErrorException ( 'config is invalid, ' . $keys [0] . ' and ' . $k . ' conflicts' );
} else {
$confObj->$keys [0] = $this->deepCloneR ( $confObj->$keys [1] );
$this->objectMergeR ( $confObj->$keys [0], $v );
unset ( $confObj->$k );
}
}
}
}
}
return $confObj;
}
/**
* php默认是浅克隆，函数实现深克隆
*
* @param object $obj
* @return object $obj
*/
private function deepCloneR($obj) {
$objClone = clone $obj;
foreach ( $objClone as $k => $v ) {
if (is_object ( $v )) {
$objClone->$k = $this->deepCloneR ( $v );
}
}
return $objClone;
}
/**
* 递归的合并两个对象
*
* @param unknown $obj1
* @param unknown $obj2
*/
private function objectMergeR($obj1, $obj2) {
foreach ( $obj2 as $k => $v ) {
if (is_object ( $v ) && isset ( $obj1->$k ) && is_object ( $obj1->$k )) {
$this->objectMergeR ( $obj1->$k, $v );
} else {
$obj1->$k = $v;
}
}
}
}
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简单使用：
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$_ENV ['config'] = new Config ( file_get_contents ( __DIR__ . '/config.ini' ), array (
'development' => array (
'localhost.localdomain',
'localhost'
),
'production' => array ()
) );
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配置文件示例：
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[product]
db.default.dsn="mysql:host=127.0.0.1;dbname=default"
db.default.username=root
db.default.password=123456
admin.username=admin
admin.password=123456
php.error_reporting=E_ALL
php.display_errors=no
php.log_errors=yes
php.error_log=APP_PATH'/resource/log/phpError.log'
php.session.save_path=APP_PATH'/resource/data/session'
[development:product]
db.test1.dsn="mysql:host=127.0.0.1;dbname=test1"
db.test1.username=root
db.test1.password=123456
php.display_errors=yes
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