Add image watermark to uploaded images in php_PHP tutorial-PHP Tutorial-php.cn

Add image watermark to uploaded images in php_PHP tutorial

WBOY

Release： 2016-07-21 14:52:14

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相信大家都知道怎么用PHP为图片增加文字水印，可是如果水印效果为图片呢？该怎么办？别担心，下文就为您分解。我也是近日用到此功能，所以去百度上搜集到了这篇文档，希望对各位有所帮助.

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if($_POST['action']=='doup')
{
$uptypes=array('image/jpg','image/jpeg','image/pjpeg','image/gif');//Upload image file type list
$wFile=$_FILES['upfile'];//Get file path
$waterimg="water.gif";//Watermark image path //print_r($wFile);
if(in_array($wFile['type'], $uptypes))
{//Check the file type, if the uploaded file is a jpg or gif image, add a watermark
If(strstr($wFile['type'],"jp"))
{ //If the uploaded image type is jpg, pjpeg, jpeg, use imagecreatefromjpeg to read the target file
$im = imageCreatefromjpeg($wFile['tmp_name']);
$wfilew=imagesx($im);//Get the width of the image
$wfileh=imagesy($im);//Get the height of the image }
else
{//Otherwise, if the uploaded image type is gif, use imagecreatefromgif to read the target file
$im = imageCreatefromgif($wFile['tmp_name']);
$wfilew=imagesx($im);//Get the width of the image
$wfileh=imagesy($im);//Get the height of the image
}
//Set blending mode
Imagealphablending($im, true);
//Read watermark file
$im2 = imagecreatefrompng($waterimg);//If the watermark image is jpg, this can be changed to $im2 = imagecreatefromjpeg($waterimg) //$white = imagecolorallocate($im2, 255, 255, 255);
// imagecolortransparent($im2,$white); //Set transparent color, these two sentences are not needed $waterw=imagesx($im2);//Get the width of the watermark image
$waterh=imagesy($im2);//Get the height of the watermark image
//Randomly put watermarks into pictures
$randval = rand(0,9);//Generate random numbers between 0-9
if($randval==0||$randval==3||$randval==2||$randval==8||$randval==7){//More positions can be improved here
$wimgx=5;$wimgy=5;//Place it in the upper left corner
}else{
$wimgx=$wfilew-5-$waterw;$wimgy=$wfileh-5-$waterh;//Place in the upper right corner
} //Copy the watermark to the target file
imagecopy($im, $im2, $wimgx, $wimgy, 0, 0, $waterw,$waterh);

//Output picture
If(strstr($wFile['type'],"jp")){ //Same as above
imagejpeg($im,$wFile['tmp_name']);
}else{
imagegif($im,$wFile['tmp_name']);
}
Imagedestroy($im);
Imagedestroy($im2);
copy($wFile['tmp_name'],$wFile['name']); //Upload
}
else echo "The picture does not match!!";
}
?>