权重计算,稍加修改亦可用于分词,词频统计,全文和spam检测等
复制代码 代码如下: <?php /* vim: set expandtab tabstop=4 shiftwidth=4: */ // +------------------------------------------------------------------------ // Name : 权重计算 // Description: 稍加修改,亦可用于分词,词频统计,全文检索和垃圾检测 // Date : 2013/12/16 08:51
class weight { protected $aDict = array(array()); protected $aItems = array(); protected $sLastRule; protected $aMatchs = array(); protected $aShow = array();
private function init() { //清空记录的匹配表和输出结果 unset($this->aShow); }
public function newItems($mItems) { //导入新的项目 $this->aItems = (is_array($mItems))? $mItems: array($mItems); $this->init(); }
public function newTable(array $aTable) { //导入新的对照表,并生成字典 foreach($aTable as $iTableKey=>$sTableLine) { $aTableLine = explode(',', str_replace('|', ',', $sTableLine)); $setter = function($v, $k, $paraMeter) { $k1 = $paraMeter[0]; $oWeight = $paraMeter[1]; $oWeight->genDict($v, $k1); }; array_walk($aTableLine, $setter, array($iTableKey, $this)); } $this->init(); }
public function getShow($sRule = 'max') { //获取最终的显示结果 if(empty($this->aItems) || empty($this->aDict)) return array(); if (empty($this->aShow) || $sRule != $this->sLastRule) return $this->genShow($sRule); return $this->aShow; }
public function genShow($sRule) { $aShow = array(); $aMatchs = array(); $getter = function($v, $k, $oWeight) use(&$aShow, &$aMatchs, $sRule) { $t = array_count_values($oWeight->matchWord($v)); $aMatchs[] = $t; switch ($sRule) { case 'max': $aShow[$k] = array_keys($t, max($t)); break; } }; array_walk($this->aItems, $getter, $this); $this->aShow = $aShow; $this->aMatchs = $aMatchs; return $aShow; }
private function genDict($mWord, $iKey = '') { $iInsertPonit = count($this->aDict); $iCur = 0; //当前节点号 foreach (str_split($mWord) as $iChar) { if (isset($this->aDict[$iCur][$iChar])) { $iCur = $this->aDict[$iCur][$iChar]; continue; } $this->aDict[$iInsertPonit] = array(); $this->aDict[$iCur][$iChar] = $iInsertPonit; $iCur = $iInsertPonit; $iInsertPonit++; } $this->aDict[$iCur]['acc'][] = $iKey;
}
function matchWord($sLine) { $iCur = $iOffset = $iPosition = 0; $sLine .= "\0"; $iLen = strlen($sLine); $aReturn = array(); while($iOffset < $iLen) { $sChar = $sLine{$iOffset}; if(isset($this->aDict[$iCur][$sChar])) { $iCur = $this->aDict[$iCur][$sChar]; if(isset($this->aDict[$iCur]['acc'])) { $aReturn = array_merge($aReturn, $this->aDict[$iCur]['acc']);
$iPosition = $iOffset + 1; $iCur = 0; } } else { $iCur = 0; $iOffset = $iPosition; $iPosition = $iOffset + 1; } ++$iOffset; } return $aReturn; } }
?>
外部调用示例 复制代码 代码如下: $aItems = array( 'chinaisbig', 'whichisnot', 'totalyrightforme', ); $aTable = array( 'china,is|small', 'china,big|me', 'china,is|big,which|not,me', 'totaly|right,for,me', );
$oWeight = new ttrie; $oWeight->newItems($aItems); $aResult = $oWeight->newTable($aTable);
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