一个非常完美的读写ini格式的PHP配置类分享

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基本满足所有配置相关的需求。

/**

• 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->$k,$v1 );
  }
  } else {
  call_user_func ( array (
  $this,$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,':' 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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