PHP圖檔加logo,php為圖檔添加水印（适用于png/jpg/gif格式）

[PHP]代碼

function img_water_mark($srcImg, $waterImg, $savepath=null, $savename=null, $positon=5, $alpha=30)

{

$temp = pathinfo($srcImg);

$name = $temp['basename'];

$path = $temp['dirname'];

$exte = $temp['extension'];

$savename = $savename ? $savename : $name;

$savepath = $savepath ? $savepath : $path;

$savefile = $savepath .'/'. $savename;

$srcinfo = @getimagesize($srcImg);

if (!$srcinfo) {

return -1; //原檔案不存在

}

$waterinfo = @getimagesize($waterImg);

if (!$waterinfo) {

return -2; //水印圖檔不存在

}

$srcImgObj = image_create_from_ext($srcImg);

if (!$srcImgObj) {

return -3; //原檔案圖像對象建立失敗

}

$waterImgObj = image_create_from_ext($waterImg);

if (!$waterImgObj) {

return -4; //水印檔案圖像對象建立失敗

}

switch ($positon) {

//1頂部居左

case 1: $x=$y=0; break;

//2頂部居右

case 2: $x = $srcinfo[0]-$waterinfo[0]; $y = 0; break;

//3居中

case 3: $x = ($srcinfo[0]-$waterinfo[0])/2; $y = ($srcinfo[1]-$waterinfo[1])/2; break;

//4底部居左

case 4: $x = 0; $y = $srcinfo[1]-$waterinfo[1]; break;

//5底部居右

case 5: $x = $srcinfo[0]-$waterinfo[0]; $y = $srcinfo[1]-$waterinfo[1]; break;

default: $x=$y=0;

}

imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo[0], $waterinfo[1], $alpha);

switch ($srcinfo[2]) {

case 1: imagegif($srcImgObj, $savefile); break;

case 2: imagejpeg($srcImgObj, $savefile); break;

case 3: imagepng($srcImgObj, $savefile); break;

default: return -5; //儲存失敗

}

imagedestroy($srcImgObj);

imagedestroy($waterImgObj);

return $savefile;

}

function image_create_from_ext($imgfile)

{

$info = getimagesize($imgfile);

$im = null;

switch ($info[2]) {

case 1: $im=imagecreatefromgif($imgfile); break;

case 2: $im=imagecreatefromjpeg($imgfile); break;

case 3: $im=imagecreatefrompng($imgfile); break;

}

return $im;

}

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代碼

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