/*
* 功能:PHP圖檔水印 (水印支援圖檔)
* @param str $groundImage 背景圖檔,即需要加水印的圖檔,暫隻支援GIF,JPG,PNG格式;
* @param str $waterPos 水印位置,有10種狀态,0為随機位置;
* 1為頂端居左,2為頂端居中,3為頂端居右;
* 4為中部居左,5為中部居中,6為中部居右;
* 7為底端居左,8為底端居中,9為底端居右;
* @param str $waterImage 圖檔水印,即作為水印的圖檔,暫隻支援GIF,JPG,PNG格式;
* return str 加好水印圖檔路徑
*/
public static function imageWaterMark($groundImage, $waterPos = 0, $waterImage = "") {
$isWaterImage = FALSE;
$formatMsg = "暫不支援該檔案格式,請用圖檔處理軟體将圖檔轉換為GIF、JPG、PNG格式。";
//讀取水印檔案
if (!empty($waterImage) && file_exists($waterImage)) {
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w = $water_info[0]; //取得水印圖檔的寬
$water_h = $water_info[1]; //取得水印圖檔的高
switch ($water_info[2]) {//取得水印圖檔的格式
case 1:$water_im = imagecreatefromgif($waterImage);
break;
case 2:$water_im = imagecreatefromjpeg($waterImage);
break;
case 3:$water_im = imagecreatefrompng($waterImage);
break;
default:
Loger::log(array(
'msg' => $formatMsg,
'file' => __CLASS__ . ':' . __LINE__,
), CLogger::LEVEL_ERROR);
return false;
}
}
//讀取背景圖檔
if (!empty($groundImage) && file_exists($groundImage)) {
$ground_info = getimagesize($groundImage);
$ground_w = $ground_info[0]; //取得背景圖檔的寬
$ground_h = $ground_info[1]; //取得背景圖檔的高
switch ($ground_info[2]) {//取得背景圖檔的格式
case 1:$ground_im = imagecreatefromgif($groundImage);
break;
case 2:$ground_im = imagecreatefromjpeg($groundImage);
break;
case 3:$ground_im = imagecreatefrompng($groundImage);
break;
default:echo $formatMsg;
return false;
}
} else {
Loger::log(array(
'msg' => "需要加水印的圖檔不存在!",
'file' => __CLASS__ . ':' . __LINE__,
), CLogger::LEVEL_ERROR);
return false;
}
//水印位置
if ($isWaterImage) {//圖檔水印
$w = $water_w;
$h = $water_h;
$label = "圖檔的";
}
if (($ground_w < $w) || ($ground_h < $h)) {
Loger::log(array(
'msg' => "需要加水印的圖檔的長度或寬度比水印" . $label . "還小,無法生成水印!",
'file' => __CLASS__ . ':' . __LINE__,
), CLogger::LEVEL_ERROR);
return;
}
switch ($waterPos) {
case 0://随機
$posX = rand(0, ($ground_w - $w));
$posY = rand(0, ($ground_h - $h));
break;
case 1://1為頂端居左
$posX = 0;
$posY = 0;
break;
case 2://2為頂端居中
$posX = ($ground_w - $w) / 2;
$posY = 0;
break;
case 3://3為頂端居右
$posX = $ground_w - $w;
$posY = 0;
break;
case 4://4為中部居左
$posX = 0;
$posY = ($ground_h - $h) / 2;
break;
case 5://5為中部居中
$posX = ($ground_w - $w) / 2;
$posY = ($ground_h - $h) / 2;
break;
case 6://6為中部居右
$posX = $ground_w - $w;
$posY = ($ground_h - $h) / 2;
break;
case 7://7為底端居左
$posX = 0;
$posY = $ground_h - $h;
break;
case 8://8為底端居中
$posX = ($ground_w - $w) / 2;
$posY = $ground_h - $h;
break;
case 9://9為底端居右
$posX = $ground_w - $w - 10;
$posY = $ground_h - $h - 5;
break;
default://随機
$posX = rand(0, ($ground_w - $w));
$posY = rand(0, ($ground_h - $h));
break;
}
//設定圖像的混色模式
imagealphablending($ground_im, true);
if ($isWaterImage) {//圖檔水印
imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h); //拷貝水印到目标檔案
}
//生成水印後的圖檔
$arrInfo = pathinfo($groundImage);
$strNewImage = $arrInfo['dirname'] . '/' . $arrInfo['filename'] . '_shuiyin' . '.' . $arrInfo['extension'];
//@unlink($groundImage);
switch ($ground_info[2]) {//取得背景圖檔的格式
case 1:imagegif($ground_im, $strNewImage);
break;
case 2:imagejpeg($ground_im, $strNewImage, 100);
break;
case 3:imagepng($ground_im, $strNewImage);
break;
default:return false;
}
//釋放記憶體
if (isset($water_info)) {
unset($water_info);
}
if (isset($water_im)) {
imagedestroy($water_im);
}
unset($ground_info);
imagedestroy($ground_im);
return $strNewImage;
}