PHP development of simple book backend management system complete code for password modification function

Set up a page to determine whether the administrator is logged in ly_check.php file

<?php
require_once("config.php");  //引入数据库文件
if($_SESSION["admin"]=="")
{
   echo "<script language=javascript>alert('请重新登陆！');window.location='login.php'</script>";
}
?>

The require_once statement is exactly the same as the require statement. The only difference is that PHP will check whether the file has been included. If so, it will not Contained again.

Put the CSS style into a css.CSS file and call it in the file later.

<style>
.table{
   border: 1px solid #CAF2FF;/*边框颜色*/
   margin-top: 5px;
   margin-bottom: 5px;
   background:#a8c7ce;
}
.td_bgf {
   background:#d3eaef;
   color:#000000;
}
.td_bg {
   background:#ffffff;
   color:#344b50;
}
.ACT_btn {
   height:26px;
   width:94px;
   cursor:hand;
   border:solid 0 #111;
   font-size: 12px;
}
.bg_tr {
   font-family: "微软雅黑,Verdana, 新宋体";
   color:#e1e2e3;/*标题字体色*/
   font-size:12px;
   font-weight:bolder;
   background:#353c44;/*标题背景色*/
   line-height: 22px;
}
td {
    color:#1E5494;
    font-size:12px;
    line-height: 18px;
}
.tdbg1 {
   background:#F9F9F9;
}
.tdbg {
   BACKGROUND: #ffffff;
}
.top_link{text-decoration:none;font-size:14px;color:#FFDED2;height:0;filter:dropshadow(offX=1,offY=1,color=BD3400);}
A.top_link:link{text-decoration:none;font-size:14px;color:#FFDED2;height:0;filter:dropshadow(offX=1,offY=1,color=BD3400);}
A.top_link:visited{text-decoration:none;font-size:14px;color:#FFDED2;height:0;filter:dropshadow(offX=1,offY=1,color=BD3400);}
A.top_link:active{text-decoration:underline;font-size:14px;color:#fff;height:0;filter:dropshadow(offX=1,offY=1,color=BD3400);}
A.top_link:hover{text-decoration:underline;font-size:14px;color:#fff;height:0;filter:dropshadow(offX=1,offY=1,color=BD3400);}

.topbar {color:#ffffff}
.topbar a:link,.topbar a:visited{color:#ffffff;}
.topbar a:hover{background:#ccffcc; display:block; height:26px; padding-top:6px; color:#000000; text-decoration:none}

#table2 {
   width:100%;
   height:30px;
   border-bottom : 1px solid #fff;
   background-color: #6E4000;
}
.titledaohang {
   FONT-SIZE: 12px;
   COLOR: #551C02;
   font-weight:bolder;
   FONT-FAMILY: '微软雅黑,宋体'
}
.Leftback {
   background:#865802;
}
.leftframetable{
   border: 1px solid #4C3500;
   margin-top: 3px;
   margin-bottom: 3px;
   background:#FDF6E6;
}
</style>

The following shows the complete code for the administrator to change the login password ly_pwd.php page

<?php require_once('ly_check.php'); 
   //引入判断管理员是否登录文件
?>  
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <title>管理员密码修改</title>
  <!-- 引入CSS样式文件 -->
  <link href="css.css" rel="stylesheet" type="text/css">
</head>
<body>
<?php
$password = $_SESSION["pwd"];
$SQL = "SELECT * FROM admin where password='$password'";
$rs = mysqli_query($link,$sql);
$rows = mysqli_fetch_assoc($rs);
$submit = isset($_POST["Submit"])?$_POST["Submit"]:"";
if($submit)
{
  if($rows["password"]==$_POST["password"])
  {
    $password2=$_POST["password2"];
    $SQL = "UPDATE admin SET password='$password2' where id=1";
    mysqli_query($link,$sql);
    echo "<script>alert('修改成功,请重新进行登陆！');window.location='login.php'</script>";
    exit();
  }
  else
    ?>
    <?php
  {
    ?>
    <script>
      alert("原始密码不正确,请重新输入")
      //location.href="li_pwd.php";
    </script>
    <?php
  }
}
?>

<table cellpadding="3" cellspacing="1" border="0" width="100%" class="table" align=center>
  <form name="renpassword" method="post" action="">
    <tr>
      <th height=25 colspan=4 align="center" class="bg_tr">更改管理密码</th>
    </tr>
    <tr>
      <td width="40%" align="right" class="td_bg">用户名：</td>
      <td width="60%" class="td_bg"><?php echo $rows["username"] ?></td>
    </tr>
    <tr>
      <td align="right" class="td_bg">原密码：</td>
      <td class="td_bg"><input name="password" type="password" id="password" size="20"></td>
    </tr>
    <tr>
      <td align="right" class="td_bg">新密码：</td>
      <td class="td_bg"><input name="password1" type="password" id="password1" size="20"></td>
    </tr>
    <tr>
      <td align="right" class="td_bg">确认密码：</td>
      <td class="td_bg"><input  name="password2" type="password" id="password2" size="20"></td>
    </tr>
    <tr>
      <td colspan="2" align="center" class="td_bg">
        <input class="button" onClick="return check();" type="submit" name="Submit" value="确定更改">
      </td>
    </tr>
  </form>
</table>
</body>
</html>
<script type="text/javascript">
  <!--
  function checkspace(checkstr) {
    var str = '';
    for(i = 0; i < checkstr.length; i++) {
      str = str + ' ';
    }
    return (str == checkstr);
  }
  function check()
  {
    if(checkspace(document.renpassword.password.value)) {
      document.renpassword.password.focus();
      alert("原密码不能为空！");
      return false;
    }
    if(checkspace(document.renpassword.password1.value)) {
      document.renpassword.password1.focus();
      alert("新密码不能为空！");
      return false;
    }
    if(checkspace(document.renpassword.password2.value)) {
      document.renpassword.password2.focus();
      alert("确认密码不能为空！");
      return false;
    }
    if(document.renpassword.password1.value != document.renpassword.password2.value) {
      document.renpassword.password1.focus();
      document.renpassword.password1.value = '';
      document.renpassword.password2.value = '';
      alert("新密码和确认密码不相同，请重新输入");
      return false;
    }
    document.admininfo.submit();
  }
  //-->
</script>

Continuing Learning

new file

<?php require_once('ly_check.php'); //引入ly_check.php文件 ?> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>管理员密码修改</title>  <link href="css.css" rel="stylesheet" type="text/css"> </head> <body> <?php $password=$_SESSION["pwd"]; $sql="select * from admin where password='$password'"; $rs=mysqli_query($link,$sql); $rows=mysqli_fetch_assoc($rs); $submit = isset($_POST["Submit"])?$_POST["Submit"]:""; if($submit) { if($rows["password"]==$_POST["password"]) { $password2=$_POST["password2"]; $sql="update admin set password='$password2' where id=1"; mysqli_query($link,$sql); echo "<script>alert('修改成功,请重新进行登陆！');window.location='login.php'</script>"; exit(); } else ?> <?php { ?> <script> alert("原始密码不正确,请重新输入") //location.href="li_pwd.php"; </script> <?php } } ?> <table cellpadding="3" cellspacing="1" border="0" width="100%" class="table" align=center> <form name="renpassword" method="post" action=""> <tr> <th height=25 colspan=4 align="center" class="bg_tr">更改管理密码</th> </tr> <tr> <td width="40%" align="right" class="td_bg">用户名：</td> <td width="60%" class="td_bg"><?php echo $rows["username"] ?></td> </tr> <tr> <td align="right" class="td_bg">原密码：</td> <td class="td_bg"><input name="password" type="password" id="password" size="20"></td> </tr> <tr> <td align="right" class="td_bg">新密码：</td> <td class="td_bg"><input name="password1" type="password" id="password1" size="20"></td> </tr> <tr> <td align="right" class="td_bg">确认密码：</td> <td class="td_bg"><input name="password2" type="password" id="password2" size="20"></td> </tr> <tr> <td colspan="2" align="center" class="td_bg"> <input class="button" onClick="return check();" type="submit" name="Submit" value="确定更改"> </td> </tr> </form> </table> </body> </html> <script type="text/javascript">  </script>

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