下面給大家分享一下PHP給圖片加上圖片水印和文字水印實例,這也是網站經常用到的功能,把代碼加上去,調用就很簡單了。
核心代碼:
function imageWaterMark($groundImage, $waterPos = 0, $waterImage = "", $waterText = "", $textFont = 5, $textColor = "#FF0000") {
$isWaterImage = FALSE;
$formatMsg = "暫不支持該文件格式,請用圖片處理軟件將圖片轉換爲GIF、JPG、PNG格式。";
//讀取水印文件
if (!empty($waterImage) && file_exists($waterImage)) {
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w = $water_info[0]; //取得水印圖片的寬
$water_h = $water_info[1]; //取得水印圖片的高
switch ($water_info[2]) {//取得水印圖片的格式
case 1:$water_im = imagecreatefromgif($waterImage);
break;
case 2:$water_im = imagecreatefromjpeg($waterImage);
break;
case 3:$water_im = imagecreatefrompng($waterImage);
break;
default:die($formatMsg);
}
}
//讀取背景圖片
if (!empty($groundImage) && file_exists($groundImage)) {
$ground_info = getimagesize($groundImage);
$ground_w = $ground_info[0]; //取得背景圖片的寬
$ground_h = $ground_info[1]; //取得背景圖片的高
switch ($ground_info[2]) {//取得背景圖片的格式
case 1:$ground_im = imagecreatefromgif($groundImage);
break;
case 2:$ground_im = imagecreatefromjpeg($groundImage);
break;
case 3:$ground_im = imagecreatefrompng($groundImage);
break;
default:die($formatMsg);
}
} else {
die("需要加水印的圖片不存在!");
}
//水印位置
if ($isWaterImage) {//圖片水印
$w = $water_w;
$h = $water_h;
$label = "圖片的";
} else {//文字水印
$temp = imagettfbbox(ceil($textFont * 5), 0, "./cour.ttf", $waterText); //取得使用 TrueType 字體的文本的範圍
$w = $temp[2] - $temp[6];
$h = $temp[3] - $temp[7];
unset($temp);
$label = "文字區域";
}
if (($ground_w < $w) || ($ground_h < $h)) {
echo "需要加水印的圖片的長度或寬度比水印" . $label . "還小,無法生成水印!";
return;
}
switch ($waterPos) {
case 0://隨機
$posX = rand(0, ($ground_w - $w));
$posY = rand(0, ($ground_h - $h));
break;
case 1://1爲頂端居左
$posX = 0;
$posY = 0;
break;
case 2://2爲頂端居中
$posX = ($ground_w - $w) / 2;
$posY = 0;
break;
case 3://3爲頂端居右
$posX = $ground_w - $w;
$posY = 0;
break;
case 4://4爲中部居左
$posX = 0;
$posY = ($ground_h - $h) / 2;
break;
case 5://5爲中部居中
$posX = ($ground_w - $w) / 2;
$posY = ($ground_h - $h) / 2;
break;
case 6://6爲中部居右
$posX = $ground_w - $w;
$posY = ($ground_h - $h) / 2;
break;
case 7://7爲底端居左
$posX = 0;
$posY = $ground_h - $h;
break;
case 8://8爲底端居中
$posX = ($ground_w - $w) / 2;
$posY = $ground_h - $h;
break;
case 9://9爲底端居右
$posX = $ground_w - $w - 10; // -10 是距離右側10px 可以自己調節
$posY = $ground_h - $h - 10; // -10 是距離底部10px 可以自己調節
break;
default://隨機
$posX = rand(0, ($ground_w - $w));
$posY = rand(0, ($ground_h - $h));
break;
}
//設定圖像的混色模式
imagealphablending($ground_im, true);
if ($isWaterImage) {//圖片水印
imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h); //拷貝水印到目標文件
} else {//文字水印
if (!emptyempty($textColor) && (strlen($textColor) == 7)) {
$R = hexdec(substr($textColor, 1, 2));
$G = hexdec(substr($textColor, 3, 2));
$B = hexdec(substr($textColor, 5));
} else {
die("水印文字顏色格式不正確!");
}
imagestring($ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
}
//生成水印後的圖片
@unlink($groundImage);
switch ($ground_info[2]) {//取得背景圖片的格式
case 1:imagegif($ground_im, $groundImage);
break;
case 2:imagejpeg($ground_im, $groundImage);
break;
case 3:imagepng($ground_im, $groundImage);
break;
default:die($errorMsg);
}
//釋放內存
if (isset($water_info))
unset($water_info);
if (isset($water_im))
imagedestroy($water_im);
unset($ground_info);
imagedestroy($ground_im);
}
文字水印:
waterText('banner.jpg', 9, '','sucaihuo.com'); //背景圖片,$waterPos水印位置,水印圖片地址
圖片水印:
imageWaterMark('404.jpg', 9, 'logo.gif'); //背景圖片,$waterPos水印位置,水印圖片地址
注意:$waterImage 和 $waterText 最好不要同時使用,選其中之一即可,優先使用 $waterImage。