php入门教程简单php用户登陆完整教程

<?php
@session_start();
 mysql教程_connect('localhost','root','19860427') or die('database server no exists!');
 mysql_select_db('wk') or die('database error!'); 
 mysql_query("SET NAMES 'gbk'");//set document charset encode

 
$uid = get_value('u','post');
$login_pwd = get_value('p','post');
if(strlen($uid)<3 || strlen($uid)>12){
 alert('用户长度为3-12个字符!','');
}elseif ( strlen($login_pwd)<6 || strlen($login_pwd)>12 ){
 alert('登录密码不正确,长度为6-12位','');
}else{
 $sql = "select * from wk_member where m_uid='$uid' and m_pass='$login_pwd'";
 $result = mysql_query($sql) or die(mysql_error());
 if(mysql_num_rows($result) ){
  $rs = mysql_fetch_array($result);
  if($rs['m_pass']!=md5($login_pwd) ){
   alert('用户名与密码不匹配!','');
  }else{
   $_SESSION['uid']=array($rs['id'],$uid,$rs['m_tel']);      
   exit("<script>location='registerok.php';</script>");
  }
 }else{
  alert('登陆失败,用户名不存在!','');
 }
}

 

function get_value( $st,$str='get')
{
 if( $str == 'post' )
 {
  return $_POST[$st];
 }else{
  return $_GET[$st];
 }
}

 
?>
<form id="form1" name="form1" method="post" action="">
  <label>
  <input type="text" name="u" id="u" />
  </label>
  用户名
  <p>
    <label>
    <input type="text" name="p" id="p" />
    </label>
  密码</p>
  <p>
    <label>
    <input type="submit" name="button" id="button" value="提交" />
    </label>
  </p>
</form>                                          

 

//数据表wk_member结构
id
m_uid
m_pass

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