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php使用crypt()函數(shù)進(jìn)行加密

更新時(shí)間：2017年06月08日 16:40:07 作者：cakin24

這篇文章主要為大家詳細(xì)介紹了php使用crypt（）函數(shù)進(jìn)行加密，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

一、代碼

<?php 
 $str = '應(yīng)用crypt()函數(shù)進(jìn)行單向加密!';     //聲明字符串變量$str 
 echo '加密前$str的值為：'.$str; 
 $crypttostr = crypt($str);      //對(duì)變量$str加密 
 echo '<p>加密后$str的值為：'.$crypttostr;  //輸出加密后的變量 
?>

二、運(yùn)行結(jié)果

參數(shù)不帶salt，每次加密得出的密文都不一樣。
加密前$str的值為：應(yīng)用crypt()函數(shù)進(jìn)行單向加密!
加密后$str的值為：$1$Re4.Gg4.$D.yd00xX0fFfIfp6KrKGN0

三、代碼

<!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函數(shù)進(jìn)行數(shù)據(jù)驗(yàn)證</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 
 $conn = mysql_connect("localhost","root","root") or die("數(shù)據(jù)庫(kù)鏈接錯(cuò)誤".mysql_error()); 
 mysql_select_db("db_database21",$conn) or die("數(shù)據(jù)庫(kù)訪問(wèn)錯(cuò)誤".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">&nbsp;</td> 
 <td width="448">&nbsp;</td> 
 <td width="158">&nbsp;</td> 
 </tr> 
 <tr> 
 <td height="187">&nbsp;</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">用戶名：</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">&nbsp;</td> 
  </tr> 
  <tr> 
  <td height="30" align="right" valign="middle" class="STYLE1" scope="col">密碼：</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">&nbsp;</td> 
  </tr> 
  <tr> 
  <td height="40" colspan="3" align="center" valign="middle" scope="col"><input type="image" name="imageField" src="images/bg2.JPG" />   
   &nbsp;&nbsp;<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'>用戶登錄成功。</font>"; 
  }else{ 
   echo "<font color='green'>用戶登錄失敗!</font>"; 
  } 
 }else{ 
  echo "請(qǐng)認(rèn)真填寫用戶名和密碼！"; 
 } 
?></td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td height="200">&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 </tr> 
</table> 
</body> 
</html>

四、運(yùn)行結(jié)果