We must use the #_FILE variable when uploading files in PHP. This automatic global variable $_FILES is supported starting from PHP 4.1.0 version. Prior to this, starting with version 4.0.0, PHP supported the $HTTP_POST_FILES array. These arrays will contain all the information about the files you uploaded, of which we recommend using $_FILES.

If the PHP setting option register_globals is on, the related variable names will also exist. Starting from PHP version 4.2.0, the default value of register_globals is set to off.

We assume the name of the file upload field is userfile. The name can be whatever you want.

$_FILES['userfile']['name']
The original name of the client machine file.

$_FILES['userfile']['type']
The MIME type of the file, which requires browser support for this information, such as "image/gif".

$_FILES['userfile']['size']
The size of the uploaded file, in bytes.

$_FILES['userfile']['tmp_name']
The temporary file name stored on the server after the file is uploaded.

$_FILES['userfile']['error']
Error code related to the file upload. ['error'] was added in PHP 4.2.0.

Handling function:

move_uploaded_file()
(PHP 4 >= 4.0.3, PHP 5)

move_uploaded_file -- Move the uploaded file to a new location

Description
bool move_uploaded_file (string filename, string destination)

This function checks and ensures that the file specified by filename is a legal upload file (that is, uploaded through PHP's HTTP POST upload mechanism). If the file is legal, it is moved to the file specified by destination.

If filename is not a valid uploaded file, no operation will occur and move_uploaded_file() will return FALSE.

If filename is a valid uploaded file but cannot be moved for some reason, no action will occur and move_uploaded_file() will return FALSE. A warning is also issued.

If the target file already exists, it will be overwritten.

Example:

The code is as follows

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if(move_uploaded_file($_FILES["magfile" ]["tmp_name"], $uploaddir))

代码如下	复制代码
if(move_uploaded_file($_FILES["magfile"]["tmp_name"], $uploaddir)) { echo "Update OK!"; }

{

echo "Update OK!";
}

You can also use copy(PHP 3, PHP 4, PHP 5) copy -- copy file

bool copy (string source, string dest)

Copy files from source to dest. Returns TRUE on success, FALSE on failure.

代码如下

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Submission page:

The code is as follows

Copy code

Processing page:

The code is as follows	Copy code
if($_FILES['picurl']['size'] > 0){ If(move_uploaded_file ($_FILES['picurl']['tmp_name'], $_FILES['picurl']['name'])){ echo "Picture uploaded successfully"; } }

Other non-File type forms can still be received using $_POST['name'].

Easy implementation of uploading images in php

代码如下

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PHP上传图片简单实现

if($_GET['action'] == 'upfile')
{
$target_path = 'temp_'.$_FILES['photo']['name'];
echo '上传的临时文件：' .$_FILES['photo']['tmp_name'] . '
';
echo '上传的目标文件：' .$target_path . '
';
echo $_SERVER["SCRIPT_FILENAME"] . '
';
echo $_SERVER["OS"] . '
';
//测试函数:　move_uploaded_file
//也可以用函数：copy
move_uploaded_file($_FILES['photo']['tmp_name'], $target_path);
echo "Upload result:";
if(file_exists($target_path)) {
if($_SERVER["OS"]!="Windows_NT"){
@chmod($target_path,0604);
}
echo 'Succeed!

';
} else {
echo 'Failed!';
}
exit;
}
?>

Registration

The above code is only suitable for learning. If you want to use it on the current server, we must write it as follows

The code is as follows

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/***************************************************** ******************************

Parameter description:
$max_file_size : upload file size limit, unit BYTE
$destination_folder: Upload file path
$watermark : Whether to add a watermark (1 means adding watermark, others means not adding watermark);

Instructions for use:
1. Remove the ; number in front of the "extension=php_gd2.dll" line in the PHP.INI file, because we need to use the GD library;
2. Change extension_dir = to the directory where your php_gd2.dll is located;
*************************************************** ****************************/

//Upload file type list
$uptypes=array(
'image/jpg',
'image/jpeg',
'image/png',
'image/pjpeg',
'image/gif',
'image/bmp',
'image/x-png'
);

$max_file_size=2000000; //Upload file size limit, unit BYTE
$destination_folder="uploadimg/"; //Upload file path
$watermark=1; //Whether to add a watermark (1 means adding watermark, others means not adding watermark);
$watertype=1; //Watermark type (1 is text, 2 is picture)
$waterposition=1; //Watermark position (1 is the lower left corner, 2 is the lower right corner, 3 is the upper left corner, 4 is the upper right corner, 5 is in the center);
$waterstring="http://www.bKjia.c0m/"; //Watermark string
$waterimg="xplore.gif"; //Watermark image
$imgpreview=1; //Whether to generate a preview image (1 is generated, others are not generated);
$imgpreviewsize=1/2; //Thumbnail ratio
?>

ZwelL Image Uploader

if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
If (!is_uploaded_file($_FILES["upfile"][tmp_name]))
//Whether the file exists
{
echo "The picture does not exist!";
exit;
}

$file = $_FILES["upfile"];
If($max_file_size < $file["size"])
//Check file size
{
echo "The file is too large!";
exit;
}

if(!in_array($file["type"], $uptypes))
//Check file type
{
echo "File type does not match!".$file["type"];
exit;
}

if(!file_exists($destination_folder))
{
mkdir($destination_folder);
}

$filename=$file["tmp_name"];
$image_size = getimagesize($filename);
$pinfo=pathinfo($file["name"]);
$ftype=$pinfo['extension'];
$destination = $destination_folder.time().".".$ftype;
If (file_exists($destination) && $overwrite != true)
{
echo "The file with the same name already exists";
exit;
}

if(!move_uploaded_file ($filename, $destination))
{
echo "Error moving file";
exit;
}

$pinfo=pathinfo($destination);
$fname=$pinfo[basename];
echo " has been uploaded successfully
File name: ".$destination_folder.$fname."
" ;
echo " width:".$image_size[0];
echo " length:".$image_size[1];
echo "
Size:".$file["size"]." bytes";

if($watermark==1)
{
          $iinfo=getimagesize($destination,$iinfo);
          $nimage=imagecreatetruecolor($image_size[0],$image_size[1]);
         $white=imagecolorallocate($nimage,255,255,255);
         $black=imagecolorallocate($nimage,0,0,0);
         $red=imagecolorallocate($nimage,255,0,0);
Imagefill($nimage,0,0,$white);
         switch ($iinfo[2])
            {
case 1:
              $simage =imagecreatefromgif($destination);
             break;
case 2:
              $simage =imagecreatefromjpeg($destination);
             break;
case 3:
               $simage =imagecreatefrompng($destination);
             break;
case 6:
              $simage =imagecreatefromwbmp($destination);
             break;
                 default:
                die("Unsupported file type");
exit;
}

imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);
Imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);

switch($watertype)
            {
Case 1: // Add water print string
Imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);
             break;
Case 2: // Add watermark pictures
              $simage1 =imagecreatefromgif("xplore.gif");
Imagecopy($nimage,$simage1,0,0,0,0,85,15);
                 imagedestroy($simage1);
             break;
}

        switch ($iinfo[2])
        {
            case 1:
            //imagegif($nimage, $destination);
            imagejpeg($nimage, $destination);
            break;
            case 2:
            imagejpeg($nimage, $destination);
            break;
            case 3:
            imagepng($nimage, $destination);
            break;
            case 6:
            imagewbmp($nimage, $destination);
            //imagejpeg($nimage, $destination);
            break;
        }

        // 更多原格式文件
        imagedestroy($nimage);
        imagedestroy($simage);
    }

    if($imgpreview==1)
    {
    echo "
图片最佳:
";
    echo " 图片图片:r文件名: ";
    }
}
?>