A regular web site, when you need to upload pictures, often need to add their own site logo watermark on the picture. So how do you accomplish this? Let's start with the principle of how to add a watermark to a PHP picture.
Build the graph by judging the file type, then copy it to the original figure, fill and build the rectangle to write the imagestring () or determine the watermark type in the image program that is already fixed: one is a string, another is to add a graphic object on it. The following is a copy of the PHP image watermark reprint!
$watermark: Whether additional watermark (1 for Watermark, other for no watermark);
1. Remove the "Extension=php_gd2.dll" line in front of 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.jb51.net/list/list_15_1.htm
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 watermark (1 for Watermark, other for no watermark);
$watertype = 1; Watermark Type (1 for text, 2 for picture)
$waterposition = 1; Watermark position (1 is lower left corner, 2 is lower right corner)
, 3 is upper-left corner, 4 is upper-right corner, 5 is centered);
$waterstring = "<a href=" http://www.xplore.cn/">
Http://www.xplore.cn/</a> "; Watermark String
$waterimg = "Xplore.gif"; Watermark Picture
$imgpreview = 1; Whether to generate a preview diagram (1 is a build, others are not generated);
$imgpreviewsize =1/2; Thumbnail proportions
?>
<title>zwell Image Upload Program </title>
<style type= "Text/css" >
<!--
Body
{
font-size:9pt;
}
Input
{
Background-color: #66CCFF;
border:1px inset #CCCCCC;
}
-->
</style>
<body>
<form enctype= "Multipart/form-data"
Method= "POST" name= "Upform" >
Upload file:
<input name= "upfile" type= "File" >
<input type= "Submit" value= "Upload" ><br>
The types of files allowed to upload are: <?=implode (', ', $uptypes)?>
</form>
<?php
if ($_server[' request_method '] = = ' POST ')
{
if (!is_uploaded_file ($_files["Upfile")
[Tmp_name])
Is there a file
{
echo "Picture does not exist!";
Exit
}
$file = $_files["Upfile"];
if ($max _file_size < $file ["size"])
Check File size
{
echo "file is too big!";
Exit
}
if (!in_array ($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) &&
$overwrite!= True)
{
echo "file with the same name already exists";
Exit
}
if (!move_uploaded_file ($filename,
$destination))
{
echo "Move file Error";
Exit
}
$pinfo =pathinfo ($destination);
$fname = $pinfo [basename];
echo "<font color=red> has been successfully uploaded
</font><br> file Name:
<font color=blue> ". $destination _folder.
$fname. " </font><br> ";
echo "width:". $image _size[0];
echo "Length:". $image _size[1];
echo "<br> 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 watermark String
Imagestring ($nimage, 2,3, $image _size[1]-15,
$waterstring, $black);
Break
Case 2://Add watermark Picture
$simage 1 =imagecreatefromgif ("Xplore.gif");
Imagecopy ($nimage, $simage 1,0,0,0,0,85,15);
Imagedestroy ($simage 1);
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, $destination);
Break
}
Overwrite original upload file
Imagedestroy ($nimage);
Imagedestroy ($simage);
}
if ($imgpreview ==1)
{
echo "<br> picture preview:<br>";
echo "<ccid_file values=" \ "Width=".
($image _size[0]* $imgpreviewsize). "
Height= ". ($image _size[1]* $imgpreviewsize); "
echo "alt=\" Picture preview: \ r file name: ".
$destination. " \ r upload time: \ "/>";
}
}
?>
</body>
