PHP编程实现csv文件导入mysql数据库的方法

<?php
$username="root";
$userpass="123";
$dbhost="localhost";
$dbdatabase="credits2stakes";
//生成一个连接
$db_connect=mysql_connect($dbhost,$username,$userpass) or die("unable to connect to the mysql!");
//选择一个需要操作的数据库
mysql_select_db($dbdatabase,$db_connect);

<meta http-equiv="content-type"content="text/html; charset=utf-8" />
<form name="frm1" enctype="multipart/form-data" action="insertdb.php" method="post">
  <input name="filename" type="file" /><input name="submit" type="submit" value="import" />
</form>

<?php
session_start();
header("content-type:text/html;charset:utf-8");
//全局变量
$file=$_files['filename'];
$max_size="2000000"; //最大文件限制（单位：byte）
$fname=$file['name'];
$ftype=strtolower(substr(strrchr($fname,'.'),1));
//文件格式
$uploadfile=$file['tmp_name'];
if($_server['request_method']=='post'){
   if(is_uploaded_file($uploadfile)){
     if($file['size']>$max_size){
     echo "import file is too large";
     exit;
     }
     if($ftype!='csv'){
     echo "import file type is error";
     exit;
     }
   }else{
   echo "the file is not empty!";
   exit;
   }
}
require("./config.db.php");  //连接mysql数据库
$row=0;
$filename=$file['tmp_name'];
$handle=fopen($filename,'r');
while(!feof($handle) && $data=fgetcsv($handle,1000,',')){
  $arr_result=array();
  if($row==0){
   $row++;
   continue;
  }
  if($row>0 && !empty($data)){
    $num=count($data);
    for($i=0;$i<$num;$i++){
    array_push($arr_result,$data[$i]);
   }
  //$name = iconv('gb2312','utf-8',$arr_result[1]);
  //$sex = iconv('gb2312','utf-8',$arr_result[2]);
  $sql="insert into inviter(inviter,invitees,time) value($arr_result[1],$arr_result[2],$arr_result[3])";
  //echo $sql;
  mysql_query("set names utf8");
  $result=mysql_query($sql);
  if($result){
    echo "插入成功！！！";
   }else{
    echo "插入失败！！！";
      }
   }
   $row++;
}
fclose($handle);
?>