<?php

   //定义编码

  header( 'Content-Type:text/html;charset=utf-8 '); 

   $words=array('我','你','他');

   $content="测一测我是不是违禁词";

   $banned=generateRegularExpression($words);

  //检查违禁词

   $res_banned=check_words($banned,$content);

   write_html($content,$res_banned);

  /**

     * @describe 数组生成正则表达式

     * @param array $words

     * @return string

     */

    function generateRegularExpression($words)

    {

        $regular = implode('|', array_map('preg_quote', $words));

        return "/$regular/i";

    }

    /**

     * @describe 字符串 生成正则表达式

     * @param array $words

     * @return string

     */

    function generateRegularExpressionString($string){

          $str_arr[0]=$string;

          $str_new_arr=  array_map('preg_quote', $str_arr);

          return $str_new_arr[0];

    }

    /**

     * 检查敏感词

     * @param $banned

     * @param $string

     * @return bool|string

     */

    function check_words($banned,$string)

    {    $match_banned=array();

        //循环查出所有敏感词

        $new_banned=strtolower($banned);

        $i=0;

        do{

            $matches=null;

            if (!empty($new_banned) && preg_match($new_banned, $string, $matches)) {

                $isempyt=empty($matches[0]);

                if(!$isempyt){

                    $match_banned = array_merge($match_banned, $matches);

                    $matches_str=strtolower(generateRegularExpressionString($matches[0]));

                    $new_banned=str_replace("|".$matches_str."|","|",$new_banned);

                    $new_banned=str_replace("/".$matches_str."|","/",$new_banned);

                    $new_banned=str_replace("|".$matches_str."/","/",$new_banned);

                }

            }

            $i++;

            if($i>20){

                $isempyt=true;

                break;

            }

        }while(count($matches)>0 && !$isempyt);

        //查出敏感词

        if($match_banned){

            return $match_banned;

        }

        //没有查出敏感词

        return array();

    }

      /**

     * 打印到页面上

     * @param $filepath

     * @param $res_mingan

     * @param $res_banned

     */

    function write_html($content,$res_banned){

            print_r($content);

            if($res_banned){

                print_r("  <font color='red'>违禁词（".count($res_banned)."）：</font>".implode('|',$res_banned));

            }

            echo "<br>";

    }