收藏敏感词过滤代码

/**
 * @todo 敏感词过滤，返回结果
 * @param array $list  定义敏感词一维数组
 * @param string $string 要过滤的内容
 * @return string $log 处理结果
 */
function sensitive($list, $string){
  $count = 0; //违规词的个数
  $sensitiveWord = '';  //违规词
  $stringAfter = $string;  //替换后的内容
  $pattern = "/".implode("|",$list)."/i"; //定义正则表达式
  if(preg_match_all($pattern, $string, $matches)){ //匹配到了结果
    $patternList = $matches[0];  //匹配到的数组
    $count = count($patternList);
    $sensitiveWord = implode(',', $patternList); //敏感词数组转字符串
    $replaceArray = array_combine($patternList,array_fill(0,count($patternList),'*')); //把匹配到的数组进行合并，替换使用
    $stringAfter = strtr($string, $replaceArray); //结果替换
  }
  $log = "原句为 [ {$string} ]
";
  if($count==0){
    $log .= "暂未匹配到敏感词！";
  }else{
    $log .= "匹配到 [ {$count} ]个敏感词：[ {$sensitiveWord} ]
".
      "替换后为：[ {$stringAfter} ]";
  }
  return $log;
}