本文实现的功能特别适用于一些商城和图片站中,分享了图片在上传时添加文字和图片水印的技巧,供大家参考,具体内容如下
1. water.class.PHP
//水印位置
public $pos = 1;
//压缩比
public $pct = 80;
//透明度
public $quality = 80;
public $text = '乐趣网zlblog.sinaapp.com';
public $size = 12;
public $color = '#000000';
public $font = 'font.ttf';
public function watermark( $img,$pos='',$out_img='',$water_img='',$text='' ){
if(!$this->check($img) || !$this->watermark_on) return false;
$water_img = $water_img ? $water_img : $this->water_img;
//水印的开启状态
$waterimg_on = $this->check($water_img) ? 1 : 0;
//判断是否在原图上操作
$out_img = $out_img ? $out_img : $img;
//判断水印的位置
$pos = $pos ? $pos : $this->pos;
//水印<a href="/tag/wenzi/" target="_blank" class="keywords">文字</a>
$text = $text ? $text : $this->text;
$img_info = getimagesize($img);
$img_w = $img_info[0];
$img_h = $img_info[1];
//判断水印<a href="/tag/tupian/" target="_blank" class="keywords">图片</a>的类型
if( $waterimg_on ){
$w_info = getimagesize($water_img);
$w_w = $w_info[0];
$w_h = $w_info[1];
if ( $img_w < $w_w || $img_h < $w_h ) return false;
switch ( $w_info[2] ){
case 1:
$w_img = imagecreatefromgif($water_img);
break;
case 2:
$w_img = imagecreatefromjpeg($water_img);
break;
case 3:
$w_img = imagecreatefrompng($water_img);
break;
}
}else{
if( empty($text) || strlen($this->color)!=7 ) return FALSE;
$text_info = imagettfb<a href="/tag/Box/" target="_blank" class="keywords">Box</a>($this->size,$this->font,$text);
$w_w = $text_info[2] - $text_info[6];
$w_h = $text_info[3] - $text_info[7];
}
//建立原图资源
switch ( $img_info[2] ){
case 1:
$res_img = imagecreatefromgif($img);
break;
case 2:
$res_img = imagecreatefromjpeg($img);
break;
case 3:
$res_img = imagecreatefrompng($img);
break;
}
//确定水印的位置
switch ( $pos ){
case 1:
$x = $y =25;
break;
case 2:
$x = ($img_w - $w_w)/2;
$y = 25;
break;
case 3:
$x = $img_w - $w_w;
$y = 25;
break;
case 4:
$x = 25;
$y = ($img_h - $w_h)/2;
break;
case 5:
$x = ($img_w - $w_w)/2;
$y = ($img_h - $w_h)/2;
break;
case 6:
$x = $img_w - $w_w;
$y = ($img_h - $w_h)/2;
break;
case 7:
$x = 25;
$y = $img_h - $w_h;
break;
case 8:
$x = ($img_w - $w_w)/2;
$y = $img_h - $w_h;
break;
case 9:
$x = $img_w - $w_w;
$y = $img_h - $w_h;
break;
default :
$x = mt_rand(25,$img_w - $w_w);
$y = mt_rand(25,$img_h - $w_h);
}
//写入<a href="/tag/tupian/" target="_blank" class="keywords">图片</a>资源
if( $waterimg_on ){
imagecopymerge($res_img,$w_img,$x,$y,$w_w,$w_h,$this->pct);
}else{
$r = hexdec(substr($this->color,1,2));
$g = hexdec(substr($this->color,3,2));
$b = hexdec(substr($this->color,5,2));
$color = imagecolorallocate($res_img,$r,$g,$b);
imagettftext($res_img,$this->size,$color,$text);
}
//生成图片类型
switch ( $img_info[2] ){
case 1:
imagecreatefromgif($res_img,$out_img);
break;
case 2:
//imagecreatefromjpeg($res_img,$out_img);
imagejpeg($res_img,$out_img);
break;
case 3:
imagejpeg($res_img,$out_img);
break;
}
if(isset($res_img)) imagedestroy ($res_img);
if(isset($w_img)) imagedestroy($w_img);
return TRUE;
}
//验证图片是否存在
private function check($img){
$type = array('.jpg','.jpeg','.png','.gif');
$img_type = strtolower(strrchr($img,'.'));
return extension_loaded('gd') && file_exists($img) && in_array($img_type,$type);
}
}
2. test1.PHP
- To change this license header,choose Tools | Templates
- and open the template in the editor.
*/
//header('Content-Type:text/html;charset=utf-8');
include 'water.class.php';
$image = new Water();
$image->watermark('12.jpg',5);
//$image->watermark('12.jpg',1);