本文实例讲述了PHP屏蔽过滤指定关键字的方法。分享给大家供大家参考。具体分析如下:
实现思路:
一、把关键字专门写在一个文本文件里,每行一个,数量不限,有多少写多少。
二、PHP读取关键字文本,存入一个数组
三、遍历关键字数组,挨个用strpos函数去看看内容有没有关键字,如果有,返回true,没有则返回false
PHP代码如下:
代码如下:
/* PHP中用strpos函数过滤关键字 */
// 关键字过滤函数
function keyWordCheck($content){
// 去除空白
$content = trim($content);
// 读取关键字文本
$content = @file_get_contents('keyWords.txt');
// 转换成数组
$arr = explode("n", $content);
// 遍历检测
for($i=0,$k=count($arr);$i
// 如果此数组元素为空则跳过此次循环
if($arr[$i]==''){
continue;
}
// 如果检测到关键字,则返回匹配的关键字,并终止运行
if(@strpos($str,trim($arr[$i]))!==false){
//$i=$k;
return $arr[$i];
}
}
// 如果没有检测到关键字则返回false
return false;
}
$content = '这里是要发布的文本内容。。。';
// 过滤关键字
$keyWord = keyWordCheck($content);
// 判断是否存在关键字
if($keyWord){
echo '你发布的内容存在关键字'.$keyWord;
}else{
echo '恭喜!通过关键字检测';
// 往下可以进行写库操作完成发布动作。
}
例子2 (注:中文关键字过滤时使用的关键字文件为utf-8编码)
代码如下:
/**
* 被禁止的关键字检测
*
* @param string $string 要检测的字符串
* @param string $fileName 屏蔽关键字文件
* @return bool
*/
function banwordCheck( $string, $fileName )
{
if ( !($words = file_get_contents( $fileName )) ){
die('file read error!');
}
$string = strtolower($string);
$matched = preg_match('/'.$words.'/i', $string, $result);
if ( $matched && isset($result[0]) && strlen($result[0]) > 0 )
{
if ( strlen($result[0]) == 2 ){
$matched = preg_match('/'.$words.'/iu', $string, $result);
}
if ( $matched && isset($result[0]) && strlen($result[0]) > 0 ) {
return true;
}else{
return false;
}
}else{
return false;
}
}
$content = '测试关键字';
if ( banwordCheck($content, './banwords.txt') ){
echo "matched! ";
}else{
echo "no match! ";
}
希望本文所述对大家的PHP程序设计有所帮助。

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