PHP与SQL语句常用大全

<"localhost","root","root");
mysql_select_db("db_database17",$conn);
mysql_query("set names gb2312");
"select usernc,face,ip,email,qq from tb_user where id='".$info["userid"]."'",$conn);
$info1=mysql_fetch_array($sql1); 
echo $info1["face"];
"savereg.php"
<input type="text" name="usernc"
<input type="text" name="userpwd"
<input type="text" name="truename" 
<"insert into tb_user(usernc,userpwd,truename,email,qq,tel,ip,address,face,regtime,sex,usertype) values('".$usernc."','".md5(trim($_POST["userpwd"]))."','".$_POST["truename"]."','".$_POST["email"]."','".$_POST["qq"]."','".$_POST["tel"]."','".$ip."','".$_POST["address"]."','".$_POST["face"]."','".date("Y-m-d H:i:s")."','".$_POST["sex"]."','0')",$conn)){
if($_SESSION["unc"]!=""){
  session_unregister("unc");
  }
session_register("unc");
  $_SESSION["unc"]=$usernc;  
  echo "<script>alert('注册成功！');history.back();</script>";
}else{
  echo "<script>alert('注册失败！');history.back();</script>";
}
"select count(*) as total from tb_leaveword ",$conn);//把查询的结果存入total中
  $info=mysql_fetch_array($sql);
  $total=$info[total];
  if($total==0){
   echo "<div align=center>对不起，暂无留言！</div>";
  }else{
   if(!isset($_GET["page"]) || !is_numeric($_GET["page"])){
     $page=1; 
   }else{
     $page=intval($_GET["page"]);
   }
   $pagesize=3;
   if($total%$pagesize==0){
     $pagecount=intval($total/$pagesize);
   }else{
     $pagecount=ceil($total/$pagesize);
   }
   $sql=mysql_query("select * from tb_leaveword order by createtime desc limit ".($page-1)*$pagesize.",$pagesize ",$conn);
   while($info=mysql_fetch_array($sql)){
   "520" height="5" border="0" align="center" cellpadding="0" cellspacing="0">
   <tr>
    <td></td>
   </tr>
  </table>
   <table width="550" height="155" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#FCD424">
    <tr>
     <td bgcolor="#FFFFFF" valign="top"><table width="550" height="24" border="0" align="center" cellpadding="0" cellspacing="0">
      <tr>
       <td width="450" background="images/dh_back_1.gif">&nbsp;主&nbsp;&nbsp;题：<"title"]);"100" background="images/dh_back_1.gif"><div align="center">
   <script language="javascript">
    function openeditwindow(x){
    window.open("editleaveword.php"+x,"newframe","top=100,left=200,width=450,height=280,menubar=no,location=no,scrollbars=no,status=no");
   }
   </script>
  <"select usernc from tb_user where id='".$info["userid"]."'",$conn);
   $infou=mysql_fetch_array($sqlu);
   if($infou["usernc"]==$_SESSION["unc"]){
  "javascript:openeditwindow(<" class="a1">编辑</a>
  <"unc"]!=""){
   $sqld=mysql_query("select usertype from tb_user where usernc='".$_SESSION["unc"]."'",$conn);
        $infod=mysql_fetch_array($sqld);
   if($infod["usertype"]==1){ 
   "javascript:if(window.confirm('确定删除该留言信息么？')==true){window.location.href='deleteleaveword.php" class="a1">删除</a>
  <"550" height="5" border="0" align="center" cellpadding="0" cellspacing="0">
       <tr>
        <td></td>
       </tr>
      </table>
  <table width="550" height="120" border="0" align="center" cellpadding="0" cellspacing="0">
       <tr>
        <td width="150" height="90"><div align="center"><img src="/UploadFiles/2021-04-02/<">

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