敏感词检查函数

if (!function_exists('checkWords')) {
    /**
     * 检查敏感词
     * @param $list
     * @param $str
     * @return string
     */
    function checkWords($list, $str, $flag = false)
    {
        $count = 0; //违规词的个数
        $sensitiveWord = '';  //违规词
        $stringAfter = $str;  //替换后的内容
        $pattern = "/" . implode("|", $list) . "/i"; //定义正则表达式
        if (preg_match_all($pattern, $str, $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
//            $stringAfter = strtr($str, $replaceArray); //结果替换

            // 临时解决方案
            $itemArr = [];
            if (!empty($patternList)) {
                foreach ($patternList as $val) {
                    if (!$val) {
                        continue;
                    }
                    $itemArr[] = str_pad("", mb_strlen($val), "*", STR_PAD_LEFT);
                }
            }
            $replaceArray = array_combine($patternList, $itemArr); //把匹配到的数组进行合并，替换使用
            $stringAfter = strtr($str, $replaceArray); //结果替换
        }
        $log = "原句为 [ {$str} ]<br/>";
        if ($count == 0) {
            $log .= "暂未匹配到敏感词！";
        } else {
            $log .= "匹配到 [ {$count} ]个敏感词：[ {$sensitiveWord} ]<br/>" .
                "替换后为：[ {$stringAfter} ]";
        }
        if (!$flag) {
            return $stringAfter;
        } else {
            return $count;
        }
    }
}

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