mod.php

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<?php

session_start();

include_once 'conn.php';
$addnew = $_POST["addnew"];
if ($addnew == "1") {
    $username  = $_POST['username'];
    $pwd       = $_POST['xmm1'];
    $pwdy      = $_POST['ymm'];
    $sql       = "select * from allusers where username='" . $_SESSION['username'] . "'";
    $query     = mysql_query($sql);
    $rowscount = mysql_num_rows($query);
    if ($rowscount > 0) {
        if (mysql_result($query, 0, "pwd") == $pwdy) {
            $sql   = "update allusers set pwd='$pwd' where username='" . $_SESSION['username'] . "'";
            $query = mysql_query($sql);
            echo "<script language='javascript'>alert('修改成功！');history.back();</script>";
        } else {
            echo "<script language='javascript'>alert('对不起,原密码不正确！');history.back();</script>";
        }
    } else {
        echo "<script language='javascript'>alert('对不起,原密码不正确！');history.back();</script>";
    }
}
?>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>修改密码</title>
</head>
<script>
function check()
{
	if(document.form1.ymm.value=="")
	{
		alert("请输入原密码");
		document.form1.ymm.focus();
		return false;
	}
	if(document.form1.xmm1.value=="")
	{
		alert("请输入新密码");
		document.form1.xmm1.focus();
		return false;
	}
	if(document.form1.xmm2.value=="")
	{
		alert("请输入确认密码");
		document.form1.xmm2.focus();
		return false;
	}
	if (document.form1.xmm1.value!=document.form1.xmm2.value)
	{
		alert("对不起，两次密码不一至，请重新输入");
		document.form1.xmm1.value="";
		document.form1.xmm2.value="";
		document.form1.xmm1.focus();
		return false;
	}
}