PHP watermark image example code_PHP tutorial

PHP adds watermark to pictures example code

PHP adds watermark to pictures example code:

This is also a commonly used function. The program that uses PHP to add watermarks to uploaded images is to create a graphic by judging the file type, then copy it to the original graphic, fill in and create a rectangle, and prepare it for writing to the image string. (), or determine the watermark type in the original image program: one is a string, and the other is to add a graphic object on top. Mainly using PHP's GD library.

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 ; sign 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;
3. http://www.knowsky.com/php.asp;
*************************************************** **/
//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.xplore.cn/"; //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
?>

Upload files:



The file types allowed to be uploaded are:

if ($_SERVER[’REQUEST_METHOD’] == ‘POST’)
{
If (!is_uploaded_file($_FILES["upfile"][tmp_name]))
//Does the file exist?
{ 
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 " 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("不支持的文件类型");  
            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($watertype)  
        {  
            case 1:   //加水印字符串  
            imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);  
            break;  
            case 2:   //加水印图片  
            $simage1 =imagecreatefromgif("xplore.gif");  
            imagecopy($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, $destination); 
              break;                                                                                                                                    ​​​​//Overwrite the original uploaded file
Imagedestroy($nimage);
Imagedestroy($simage);
}  
If($imgpreview==1)
{ 
echo "
Picture preview:
";
echo " height=".($image_size[1]*$imgpreviewsize);"
echo " alt="Picture preview:rFile name:".$destination."rUpload time:" />";
}  
}
?>

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