PHP文件上载问题

时间:2012-02-24 02:28:58

标签: php file-upload

我正在寻找PHP文件上传方面的帮助。我正在尝试上传图像,使用以下代码(在w3schools教程中提供):

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"] . "<br />";
}
 else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";

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";
  }

显然我对他们的代码进行了一些更改,但它并没有按照它所说的那样做。所以我问:

  1. 为什么这不会像它声称的那样创建一个名为'upload'的新文件夹?我收到以下错误: Warning: move_uploaded_file(upload/donkeykong.jpg) [function.move-uploaded-file]: failed to open stream: No such file or directory in ... etc.

  2. 我应该如何编写我想要上传图片的网址?

4 个答案:

答案 0 :(得分:3)

它不会创建文件夹,因为永远不会调用mkdir()。该代码假定upload/目录已存在。如果目录不存在,则创建目录:

if (!file_exists('upload')) {
  mkdir('./upload');
}

顺便说一下,开头的陈述可以通过多种方式清理。一种可能性是使用in_array()而不是一堆||条件:

if (in_array($_FILES['file']['type'], array("image/gif", "image/jpeg", "image/pjpeg")
  && ($_FILES["file"]["size"] < 20000)
)

要将上传文件放在相对于服务器文档根目录的upload/中,您可以使用$_SERVER['DOCUMENT_ROOT']。但是,您应手动创建upload/目录并使其可由Web服务器写入。为了通过PHP创建目录,整个文档根目录需要由Web服务器写入,这是一个巨大的安全漏洞。

$uploads_dir = $_SERVER['DOCUMENT_ROOT'] . "/upload/";
move_uploaded_file($_FILES["file"]["tmp_name"], $uploads_dir . $_FILES["file"]["name"]);

答案 1 :(得分:2)

我之前构建过这个版本,适用于 JPEG JPG GIF PNG

保存到当前目录“images”。

<?
max_size = 300; //size in kbs

if($_POST['Submit'] == "Upload"){$image =$_FILES["file"]["name"];$uploadedfile = $_FILES['file']['tmp_name'];
    if ($image){$filename = stripslashes($_FILES['file']['name']);$extension = getExtension($filename); $extension = strtolower($extension);    
        if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) {$change='Invalid Picture';$errors=1;}
        else{$size=filesize($_FILES['file']['tmp_name']);
            if ($size > $max_size*1024){$change='File too big!';$errors=1;}
            else{
                if($extension=="jpg" || $extension=="jpeg" ){$uploadedfile = $_FILES['file']['tmp_name'];$src = imagecreatefromjpeg($uploadedfile);}
                else if($extension=="png"){$uploadedfile = $_FILES['file']['tmp_name'];$src = imagecreatefrompng($uploadedfile);}
                else {$src = imagecreatefromgif($uploadedfile);}
                echo $scr;
                list($width,$height)=getimagesize($uploadedfile);

                //MAIN IMAGE
                $newwidth=300;
                $newheight=($height/$width)*$newwidth;
                $tmp=imagecreatetruecolor($newwidth,$newheight);
                $kek=imagecolorallocate($tmp, 255, 255, 255);
                imagefill($tmp,0,0,$kek);
                imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

                //Does Directory Exhist?
                if(is_dir("images")==FALSE){mkdir("images");}

                //Build file path and SAVE
                $filepath = "images/".md5(genRandomString().$_FILES['file']['name']).".".$extension;
                imagejpeg($tmp,$filepath,100);
                imagejpeg($tmp,$filepath,100);
                imagedestroy($src);
                imagedestroy($tmp);

                //ERROR HANDLING
                if($_FILES["file"]["size"]<=0){$errors=1;$change='No file';}
                if($errors!=1){$change='Image Uploaded!';}
            }
        }
    }
}
?>

对于您的错误:

<div><? echo $change ?></div>

答案 2 :(得分:1)

1.通常意味着文件路径不正确或权限设置不正确。您应该创建上载目录并进行设置,以便相应的人员可以手动读取和写入。在apache中我认为它是这样的:

mkdir uploaded_files
chown -R nobody uploaded_files
chmod 755 -R uploaded_files

2.关于路径,你可以使用绝对或相对最好的方法来使用:

$_SERVER['DOCUMENT_ROOT] . '/uploaded_files'

答案 3 :(得分:1)

希望这有帮助

<?php
if (isset($_FILES['photo']))
{
    $mimetype = mime_content_type($_FILES['photo']['tmp_name']);
    if(in_array($mimetype, array('image/jpeg', 'image/gif', 'image/png'))) {

    move_uploaded_file($_FILES['photo']['tmp_name'],
 '/images/' . $_FILES['photo']['name']);
   echo 'OK';
     } else {
             echo 'Not an image file!';
     }
}