PHP实现图片和文字水印
/************************************************图片水印功能开始************************************************************/
/**
* @desc 图片添加文字水印
* @param string|file $source 背景图片，即需要加水印的图片，暂只支持GIF,JPG,PNG格式
* @param int|string $waterImage 图片水印，即作为水印的图片，暂只支持GIF,JPG,PNG格式
* @param int|string $waterPos 水印位置，有10种状态，0为随机位置 1为顶端居左，2为顶端居中，3为顶端居右； * 4为中部居左，5为中部居中，6为中部居右； * 7为底端居左，8为底端居中，9为底端居右
* @param int|string $waterText 文字水印，即把文字作为为水印，支持ASCII码，不支持中文
* @param int|string $fontSize 文字大小，值为1、2、3、4或5，默认为5
* @param int|string $textColor 文字颜色，值为十六进制颜色值，默认为#FF0000(红色)
*
*/
function CreateImageWaterMark($source,$waterImage,$waterText,$waterPos = 0, $fontSize=25, $textColor='', $font = '') {
if(empty($font)){
$font = ROOT_PATH."/static/common/lib/assets/fonts/simkai.ttf";
}
$date = ROOT_PATH.'static/upload/watermark/' . date ( 'Ymd' ) . '/';
$img = $date . md5 ( $source .$waterImage. $waterText.$waterPos . $fontSize . $textColor ) . '5.jpg';
if (file_exists ($img)) {
return $img;
}
$main = imagecreatefromjpeg ( $source );
$width = imagesx ( $main );//原图宽度
$height = imagesy ( $main );//原图高度
$target = imagecreatetruecolor ( $width, $height );
if (!empty($textColor) && (strlen($textColor) == 7)) {
$R = hexdec(substr($textColor, 1, 2));
$G = hexdec(substr($textColor, 3, 2));
$B = hexdec(substr($textColor, 5));
$white = imagecolorallocate($target, $R, $G, $B);
} else {
$white = imagecolorallocate ( $target, 255, 0, 0 );//字的RGB颜色
}
// $white = imagecolorallocate ( $target, 255, 255, 255 );
imagefill ( $target, 0, 0, $white );
imagecopyresampled ( $target, $main, 0, 0, 0, 0, $width, $height, $width, $height );
//设定图像的混色模式
imagealphablending($target, true);
//水印位置
if ($waterImage) {//图片水印
$water_info = getimagesize($waterImage);
$water_w = $water_info[0]; //取得水印图片的宽
$water_h = $water_info[1]; //取得水印图片的高
//判断水印图片的宽高
if ($waterImage && (($width < $water_w) || ($height < $water_h))) {
//将水印图按背景图的比例进行宽度压缩
$waterImage = CompressImage($waterImage,$width,$height);
$water_info = getimagesize($waterImage);
$water_w = $water_info[0]; //取得水印图片的宽
$water_h = $water_info[1]; //取得水印图片的高
}
} else {//文字水印
$fontBox = imagettfbbox($fontSize, 0, $font, $waterText);//文字水平居中实质
$water_w = $fontBox[2] - $fontBox[6];
$water_h = $fontBox[3] - $fontBox[7];
unset($fontBox);
}
switch ($waterPos) {
case 1://1为顶端居左
$posX = 0;// // -10 是距离右侧10px 可以自己调节
$posY = $waterImage ? 0 : intval($fontSize);
// $posY = intval($fontSize);
// $posY = intval($fontSize) + 10; // + 10 是距离顶部10px 可以自己调节
break;
case 2://2为顶端居中
$posX = ($width - $water_w) / 2;
$posY = $waterImage ? 0 : intval($fontSize);
// $posY = intval($fontSize);
// $posY = intval($fontSize) + 10; // + 10 是距离顶部10px 可以自己调节
break;
case 3://3为顶端居右
$posX = $waterImage ? $width - $water_w : $width - $water_w -10;//-10 是距离右侧10px 可以自己调节
$posY = $waterImage ? 0 : intval($fontSize);
// $posY = intval($fontSize);
// $posY = intval($fontSize) + 10; // + 10 是距离顶部10px 可以自己调节
break;
case 4://4为中部居左
$posX = 0;
$posY = ($height - $water_h) / 2;
break;
case 5://5为中部居中
$posX = ($width - $water_w) / 2;
$posY = ($height - $water_h) / 2;
break;
case 6://6为中部居右
$posX = $width - $water_w - 10; // -10 是距离右侧10px 可以自己调节
$posY = ($height - $water_h) / 2;
break;
case 7://7为底端居左
$posX = 0;
$posY = $height - $water_h;
break;
case 8://8为底端居中
$posX = ($width - $water_w) / 2;
$posY = $height - $water_h;
break;
case 9://9为底端居右
$posX = $width - $water_w - 10; // -10 是距离右侧10px 可以自己调节
$posY = $height - $water_h - 10; // -10 是距离底部10px 可以自己调节
break;
case 0://随机
default://随机
$posX = rand(0, ($width - $water_w));
$posY = rand(0, ($height - $water_h));
break;
}
if($waterImage && $waterText){
if (!empty($textColor) && (strlen($textColor) == 7)) {
$R = hexdec(substr($textColor, 1, 2));
$G = hexdec(substr($textColor, 3, 2));
$B = hexdec(substr($textColor, 5));
$fontColor = imagecolorallocate($target, $R, $G, $B);
} else {
$fontColor = imagecolorallocate ( $target, 255, 0, 0 );//字的RGB颜色
}
$fontBox = imagettfbbox($fontSize, 0, $font, $waterText);
imagettftext ( $target, $fontSize, 0, ceil(($width - $fontBox[2]) / 2), 560, $fontColor, $font, $waterText );
//水印图片
$water_info = getimagesize($waterImage);
switch ($water_info[2]) {//取得水印图片的格式
case 1:
$child1 = imagecreatefromgif($waterImage);
// @unlink($waterImage);
break;
case 2:
$child1 = imagecreatefromjpeg($waterImage);
// @unlink($waterImage);
break;
case 3:
$child1 = imagecreatefrompng($waterImage);
// @unlink($waterImage);
break;
default:die('水印图片格式不支持');
}
// $child1 = imagecreatefrompng( $waterImage);
imagecopymerge ( $target, $child1, $posX, $posY, 0, 0, imagesx ( $child1 ), imagesy ( $child1 ), 100 );
}elseif($waterImage){
//水印图片
$water_info = getimagesize($waterImage);
switch ($water_info[2]) {//取得水印图片的格式
case 1:
$child1 = imagecreatefromgif($waterImage);
// @unlink($waterImage);
break;
case 2:
$child1 = imagecreatefromjpeg($waterImage);
// @unlink($waterImage);
break;
case 3:
$child1 = imagecreatefrompng($waterImage);
// @unlink($waterImage);
break;
default:die('水印图片格式不支持');
}
// $child1 = imagecreatefrompng( $waterImage);
imagecopymerge ( $target, $child1, $posX, $posY, 0, 0, imagesx ( $child1 ), imagesy ( $child1 ), 100 );
}else{
if (!empty($textColor) && (strlen($textColor) == 7)) {
$R = hexdec(substr($textColor, 1, 2));
$G = hexdec(substr($textColor, 3, 2));
$B = hexdec(substr($textColor, 5));
$fontColor = imagecolorallocate($target, $R, $G, $B);
} else {
$fontColor = imagecolorallocate ( $target, 255, 0, 0 );//字的RGB颜色
}
imagettftext ( $target, $fontSize, 0, $posX, $posY, $fontColor, $font, $waterText );
}
//eof of 合成图片
if(!is_dir($date)){
@mkdir ($date,0777,true);
}
imagejpeg ( $target,$img, 95 );
imagedestroy ( $main );
imagedestroy ( $target );
if($waterImage){
imagedestroy ( $child1 );
}
return $img;
}
/**
* @desc 按比例压缩图片宽高
* @param string|file $image 图片，暂只支持GIF,JPG,PNG格式
* @param int|string $n_w 图片宽度
* @param int|string $n_h 图片高度
*
*/
function CompressImage($image,$n_w,$n_h){
$date = ROOT_PATH.'static/upload/watermark/deal/' . date ( 'Ymd' ).'/';
$imgUrl = $date . md5 ($image) . '.jpg';
if (file_exists ($imgUrl)) {
return $imgUrl;
}
$size=getimagesize($image);
switch($size[2]){
case 1:
$img=imagecreatefromgif($image);
break;
case 2:
$img=imagecreatefromjpeg($image);
break;
case 3:
$img=imagecreatefrompng($image);
break;
default:
return '图片格式不支持';
}
$width = imagesx($img);//原图片宽度
$height= imagesy($img);//原图片高度
//缩略图最大宽度与最大高度比
$thcrown = $n_w/$n_h;
//原图宽高比
$crown = $width/$height;
if($crown/$thcrown >= 1){
$n_h = $n_w/$crown;
} else {
$n_w = $n_h*$crown;
}
//1.创建画布
$new = imagecreatetruecolor($n_w, $n_h);
$img = imagecreatefrompng($image);
//2.上色
imagealphablending($new,false);//这里很重要,意思是不合并颜色,直接用$target_im图像颜色替换,包括透明色;
imagesavealpha($new,true);//这里很重要,意思是不要丢了$target_im图像的透明色;
$tag_white = imagecolorallocatealpha($new, 255, 255, 255,127);//把生成新图的白色改为透明色 存为tag_white
// $color=imagecolorallocate($new,255,255,255);
//3.设置透明
imagecolortransparent($new,$tag_white);
imagefill($new,0,0,$tag_white);
//copy部分图像并调整
imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);
// imagecopymerge($new, $img, 0, 0, 0, 0, $n_w, $n_h, 100);//合并原图和新生成的透明图
//删除原图片
@unlink($image);
//图像输出新图片、另存为
if(!is_dir($date)){
@mkdir($date,0777,true);
}
$imageUrl = $date . md5 ($image) . '.jpg';
// imagepng($new, $dest_path);
imagejpeg ( $new,$image, 95 );
imagedestroy($new);
imagedestroy($img);
return $imageUrl;
}
function generateImg($source,$waterImage, $text1, $text2, $text3, $font = '') {
if(empty($font)){
$font = ROOT_PATH."/static/common/lib/assets/fonts/simkai.ttf";
}
$date = ROOT_PATH.'static/upload/watermark/' . date ( 'Ymd' ) . '/';
$img = $date . md5 ( $source . $text1 . $text2 . $text3 ) . '.jpg';
if (file_exists ($img)) {
return $img;
}
$main = imagecreatefromjpeg ( $source );
$width = imagesx ( $main );
$height = imagesy ( $main );
$target = imagecreatetruecolor ( $width, $height );
$white = imagecolorallocate ( $target, 255, 255, 255 );
imagefill ( $target, 0, 0, $white );
imagecopyresampled ( $target, $main, 0, 0, 0, 0, $width, $height, $width, $height );
$fontSize = 18;//磅值字体
$fontColor = imagecolorallocate ( $target, 255, 0, 0 );//字的RGB颜色
$fontBox = imagettfbbox($fontSize, 0, $font, $text1);//文字水平居中实质
imagettftext ( $target, $fontSize, 0, ceil(($width - $fontBox[2]) / 2), 190, $fontColor, $font, $text1 );
$fontBox = imagettfbbox($fontSize, 0, $font, $text2);
imagettftext ( $target, $fontSize, 0, ceil(($width - $fontBox[2]) / 2), 370, $fontColor, $font, $text2 );
$fontBox = imagettfbbox($fontSize, 0, $font, $text3);
imagettftext ( $target, $fontSize, 0, ceil(($width - $fontBox[2]) / 2), 560, $fontColor, $font, $text3 );
//imageantialias($target, true);//抗锯齿，有些PHP版本有问题，谨慎使用
imagefilledpolygon ( $target, array (10 + 0, 0 + 142, 0, 12 + 142, 20 + 0, 12 + 142), 3, $fontColor );//画三角形
imageline($target, 100, 200, 20, 142, $fontColor);//画线
imagefilledrectangle ( $target, 50, 100, 250, 150, $fontColor );//画矩形
//bof of 合成图片
// $child1 = imagecreatefromjpeg ( $waterImage);
$child1 = imagecreatefrompng( $waterImage);
imagecopymerge ( $target, $child1, 0, 400, 0, 0, imagesx ( $child1 ), imagesy ( $child1 ), 100 );
//eof of 合成图片
@mkdir ($date);
imagejpeg ( $target,$img, 95 );
imagedestroy ( $main );
imagedestroy ( $target );
imagedestroy ( $child1 );
return $img;
}
/************************************************图片水印功能结束************************************************************/
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