php 文件上传(普通上传与异步上传)的例子

    
Filename:

2，upload_file.php

//php普通文件上传
//by bbs.it-home.org
if ((($_FILES["file"]["type"] == "image/gif")|| ($_FILES["file"]["type"] == "image/jpeg")|| ($_FILES["file"]["type"] == "image/pjpeg"))&& ($_FILES["file"]["size"]   if ($_FILES["file"]["error"] > 0) {
    echo "Return Code: " . $_FILES["file"]["error"] . "";
  }else {
      echo "Upload: " . $_FILES["file"]["name"] . "";
      echo "Type: " . $_FILES["file"]["type"] . "";
      echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb";
      echo "Temp file: " . $_FILES["file"]["tmp_name"] . "";

      if (file_exists("upload/" . $_FILES["file"]["name"])){
         echo $_FILES["file"]["name"] . " already exists. ";
      }else{
         move_uploaded_file($_FILES["file"]["tmp_name"],
         "upload/" . $_FILES["file"]["name"]);
         echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
      }
  }

}else {
  echo "Invalid file";
}
?>

二、异步文件上传 使用iframe异步上传文件。 1，前端html

    导入文件：

2，Js代码

function startUpload() {
    var spanObj = document.getElementById("info");
    spanObj.innerHTML = " 开始上传";
    document.getElementById("upForm").sumbit();
}
//回调
function stopUpload(responseText){
    var spanObj = document.getElementById("info");
    spanObj.innerHTML = "上传成功";
    spanObj.innerHTML = responseText;
}

2）、服务器端代码

$file = $_FILES['myfile'];
$fileName = uploadFile($file);
//$result = readFromFile("../upload/" . $fileName);
echo "";

function uploadFile($file) {
    // 上传路径
    $destinationPath = "../upload/";
    if (!file_exists($destinationPath)){
        mkdir($destinationPath , 0777);
    }
    //重命名
    $fileName = date('YmdHis') . '_' . iconv('utf-8' , 'gb2312' , basename($file['name']));
    if (move_uploaded_file($file['tmp_name'], $destinationPath . $fileName)) {
        return iconv('gb2312' , 'utf-8' , $fileName);
    }
    return '';
}
//代码注释
/*
1，关于basename方法
$path = "/testweb/home.php";
//显示带有文件扩展名的文件名
echo basename($path);
//显示不带有文件扩展名的文件名
echo basename($path,".php");

2，关于iconv
iconv('gb2312' , 'utf-8' , $fileName);//将$fileName从gb2312转为utf-8格式。
注：该函数需要开启php.ini里面的php_iconv.dll

3，关于$_FILES['myfile']
$_FILES相当于一个二维数组，而$_FILES['myfile']相当于一个一维数组。所以可以
$f = $_FILES['myfile'];
echo $f['name'];

如果直接访问该$_FILES['myfile']，则会报Undefined index: myfile。此时加上
if(!isset($_FILES['myfile'])){
    die('上传文件不存在！');
}
*/