Examples of php file upload (normal upload and asynchronous upload)

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"] < 20000)){
  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), server-side code

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

function uploadFile($ file) {
 // Upload path
 $destinationPath = "../upload/";
 if (!file_exists($destinationPath)){
 mkdir($destinationPath , 0777);
 }
 //Rename
 $fileName = date('YmdHis') . '_' . iconv('utf-8' , 'gb2312' , basename($file['name']));
 if (move_uploaded_file($file['tmp_name'], $ destinationPath . $fileName)) {
 return iconv('gb2312' , 'utf-8' , $fileName);
 }
 return '';
}
//Code Comments
/ *
1, about the basename method
$path = "/testweb/home.php";
//Display the file name with the file extension
echo basename($path);
//Display without the file extension The file name
echo basename($path,".php");

2, about iconv
iconv('gb2312', 'utf-8', $fileName);//Convert $fileName from gb2312 to utf- 8 format.
Note: This function needs to open php_iconv.dll in php.ini

3, about $_FILES['myfile']
$_FILES is equivalent to a two-dimensional array, and $_FILES['myfile'] is equivalent to a one-dimensional array array. So
$f = $_FILES['myfile'];
echo $f['name'];

If you directly access the $_FILES['myfile'], Undefined index: myfile will be reported. At this time add
if(!isset($_FILES['myfile'])){
 die('The uploaded file does not exist!');
}
*/