PHP使用正则表达式实现过滤非法字符串功能示例

2024-05-04 22:43:06

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本文实例讲述了PHP使用正则表达式实现过滤非法字符串功能。分享给大家供大家参考，具体如下：

一、代码

1、index.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>过滤留言板中的非法字符</title><style type="text/css"><!--body {  margin-left: 0px;  margin-top: 0px;  margin-right: 0px;  margin-bottom: 0px;}--></style></head><body><table width="1002" height="585" border="0" align="center" cellpadding="0" cellspacing="0"> <tr>  <td width="379" height="226"> </td>  <td width="445"> </td>  <td width="178"> </td> </tr>   <form id="form1" name="form1" method="post" action="index_ok.php"> <tr>  <td height="260"> </td>  <td align="center" valign="top"><table width="430" border="1" cellpadding="1" cellspacing="1" bordercolor="#FFFFFF" bgcolor="#99CC67">   <tr>    <td width="81" height="30" align="right" bgcolor="#FFFFFF">发布主题：</td>    <td width="307" align="left" bgcolor="#FFFFFF"><input name="title" type="text" id="title" size="30" /></td>   </tr>   <tr>    <td align="right" bgcolor="#FFFFFF">发布内容：</td>    <td align="left" bgcolor="#FFFFFF"><textarea name="content" cols="43" rows="13" id="content"></textarea></td>   </tr>  </table></td>  <td> </td> </tr> <tr>  <td height="99"> </td>  <td align="center" valign="top"><table width="315" height="37" border="0" cellpadding="0" cellspacing="0">   <tr>    <td width="169" align="center"><input type="image" name="imageField" src="images/bg1.JPG" /></td>    <td width="146" align="center"><input type="image" name="imageField2" src="images/bg3.JPG" onclick="form.reset();return false;" /></td>   </tr>  </table></td>  <td> </td> </tr>   </form></table></body></html>

2、index_ok.php

<?php$title=$_POST[title];$content=$_POST[content];$str="****";$titles = preg_replace("/(黑客)|(抓包)|(监听)/",$str,$title);$contents = preg_replace("/(黑客)|(抓包)|(监听)/",$str,$content);?><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>过滤留言板中的非法字符</title><style type="text/css"><!--body {  margin-left: 0px;  margin-top: 0px;  margin-right: 0px;  margin-bottom: 0px;}.STYLE1 {  font-size: 12px;  color: #855201;}--></style></head><body><table width="1002" height="585" border="0" align="center" cellpadding="0" cellspacing="0"> <tr>  <td width="400" height="226"> </td>  <td width="406"> </td>  <td width="196"> </td> </tr>   <form id="form1" name="form1" method="post" action="index_ok.php"> <tr>  <td height="260"> </td>  <td align="left" valign="top"><p class="STYLE1">发布主题：<?php echo $titles;?></p>   <p class="STYLE1">发布内容：<?php echo $contents;?></p></td>  <td> </td> </tr> <tr>  <td> </td>  <td align="center" valign="top"> </td>  <td> </td> </tr> </form></table></body></html>

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