<?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> <?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 cellpadding="0" cellspacing="0" background="images/bg.jpg"> <tr> <td> </td> <td> </td> <td> </td> </tr> <tr> <td> </td> <td valign="middle"> <form method="post" action="index.php"> <table cellpadding="0" cellspacing="0"> <tr> <td valign="middle" scope="col"><span>用户名：</span></td> <td valign="middle" scope="col"><label for="textfield"></label> <input type="text" size="24" /></td> <td valign="middle" scope="col"> </td> </tr> <tr> <td valign="middle" scope="col">密码：</td> <td valign="middle" scope="col"><input type="password" size="25" /></td> <td valign="middle" scope="col"> </td> </tr> <tr> <td colspan="3" valign="middle" scope="col"><input type="image" src="https://www.jb51.net/images/bg2.JPG" /> <input type="image" src="https://www.jb51.net/images/bg1.JPG" /></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> </td> <td> </td> <td> </td> </tr> </table> </body> </html>
四、运行结果
