一 代码
<?php $str = '应用crypt()函数进行单向加密!'; //声明字符串变量$str echo '加密前$str的值为：'.$str; $crypttostr = crypt($str); //对变量$str加密 echo '<p>加密后$str的值为：'.$crypttostr; //输出加密后的变量 ?>
二 运行结果
参数不带salt，每次加密得出的密文都不一样。
加密前$str的值为：应用crypt()函数进行单向加密!
加密后$str的值为：$1$Re4.Gg4.$D.yd00xX0fFfIfp6KrKGN0
三 代码
<!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>使用crypt函数进行数据验证</title>
<style type="text/css">
<!--
body,td,th {
font-size: 12px;
}
body {
margin-left: 10px;
margin-top: 10px;
margin-right: 10px;
margin-bottom: 10px;
}
.STYLE1 {
font-size: 14px;
font-weight: bold;
}
-->
</style>
</head>
<body>
<div align="center">
<?php
$conn = mysql_connect("localhost","root","root") or die("数据库链接错误".mysql_error());
mysql_select_db("db_database21",$conn) or die("数据库访问错误".mysql_error());
mysql_query("set names gb2312");
?>
</div>
<table width="777" height="587" border="0" align="center" cellpadding="0" cellspacing="0" background="images/bg.jpg">
<tr>
<td width="149" height="200"> </td>
<td width="448"> </td>
<td width="158"> </td>
</tr>
<tr>
<td height="187"> </td>
<td align="center" valign="middle"> <form id="form1" name="form1" method="post" action="index.php">
<table height="129" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="100" height="30" align="right" valign="middle" scope="col"><span class="STYLE1">用户名：</span></td>
<td width="100" height="30" align="left" valign="middle" scope="col"><label for="textfield"></label>
<input name="username" type="text" id="username" size="24" /></td>
<td width="100" align="center" valign="middle" scope="col"> </td>
</tr>
<tr>
<td height="30" align="right" valign="middle" class="STYLE1" scope="col">密码：</td>
<td height="30" align="left" valign="middle" scope="col"><input name="password" type="password" id="password" size="25" /></td>
<td align="center" valign="middle" scope="col"> </td>
</tr>
<tr>
<td height="40" colspan="3" align="center" valign="middle" scope="col"><input type="image" name="imageField" src="images/bg2.JPG" />
<input type="image" name="imageField2" src="images/bg1.JPG" onclick="form.reset();return false;" /></td>
</tr>
</table>
</form>
<?php
if(trim($_POST[username])!= "" and trim($_POST[password])!= ""){
$usr = crypt(trim($_POST[username]),$_POST[username]);
$pwd = crypt(trim($_POST[password]),$_POST[password]);
$sql = "select * from tb_user where username = '".$usr."' and password='".$pwd."'";
$rst = mysql_query($sql,$conn);
$result=mysql_num_rows($rst);
if($result>0){
echo "<font color='red'>用户登录成功。</font>";
}else{
echo "<font color='green'>用户登录失败!</font>";
}
}else{
echo "请认真填写用户名和密码！";
}
?></td>
<td> </td>
</tr>
<tr>
<td height="200"> </td>
<td> </td>
<td> </td>
</tr>
</table>
</body>
</html>
四 运行结果
