php上傳文件代碼

<!DOCTYPE hmtl>
<html>
<head>
  <meta charset="utf8">
  <title>upload</title>
</head>
<body>
 <form action="upload_file.php" method="post" enctype="multipart/form-data">
 <label for="file">Filename:</label>
 <input type="file" name="file" id="file" />
 <br />
 <input type="submit" name="submit" value="submit" />
 <br />
 </form>
</body>
</html>
<?php

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 "Error: " . $_FILES["file"]["error"] . "<br />";
     }
     else
     {
        echo "<html>";
        echo "<body>";
        echo "<meta charset='utf8'>";
        echo "Upload: " . $_FILES["file"]["name"] . "<br />";
        echo "Type: " . $_FILES["file"]["type"] . "<br />";
        echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
        echo "Stored in: " . $_FILES["file"]["tmp_name"];
        echo "</body>";
        echo "</html>";
        if(file_exists("upload/" . $_FILES['file']['name']))
        {
            echo $_FILES['file']['name']."already exists. ";
        }
        else
        {
             move_uploaded_file($_FILES["file"]["tmp_name"],
             "/usr/local/nginx/html/upload/" . $_FILES["file"]["name"]);
             echo "Stored in: " . "/usr/local/nginx/html/upload/" . $_FILES["file"]["name"];
        }
     }
  }
  else
  {
     echo "Invaild file";
  }
?>
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