PHP敏感词过滤

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$str = "百度http://www.baidu.com,腾讯http://www.qq.com,新浪http://www.sina.com.cn/";;
$arr = array("/百度/", "/腾讯/", "/新浪/");
$prg = '***';
$str = preg_replace($arr, $prg, $str);
echo $str;

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$badword = array(
'张三','张三丰','张三丰田'
);
$badword1 = array_combine($badword,array_fill(0,count($badword),'*'));
$bb = '我今张张三张三张三张三张三天开着张三上张三班';
$str = strtr($bb, $badword1);
echo $str;

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/*function transgress_keyword($content, $Sensitivewords){ //定义处理违法关键字的方法
$keyword = $Sensitivewords; //定义敏感词
$m = 0;
for($i = 0; $i < count ( $keyword ); $i ++) { //根据数组元素数量执行for循环
//应用substr_count检测文章的标题和内容中是否包含敏感词
if (substr_count ( $content, $keyword [$i] ) > 0) {
$m ++;
}
}
return $m; //返回变量值，根据变量值判断是否存在敏感词
}

if (transgress_keyword($detail, $Sensitivewords)> 0) { //判断返回值大于0说明包含敏感词
echo "<script>alert('您输入的内容中含有敏感词');</script>";
} */
//-----------------------------------------------------------------------------------------------------------
/*$num = 0;//定义子串出现次数
//内容
$content=$detail;
//循环检测
for($i = 0; $i < count($Sensitivewords); $i ++) {
//计算子串在字符串中出现的次数
if (substr_count ($content, $Sensitivewords[$i]) > 0) {
$num ++;
}
}
if($num>0){
echo "有敏感词存在！";
}*/
//-----------------------------------------------------------------------------------------------------------
/*$blacklist="/".implode("|",$Sensitivewords)."/i";
if(preg_match($blacklist, $detail, $matches)){
print "found:". $matches[0];
} else {
print "not found.";
}*/