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
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<?php
header( 'Content-Type:text/html;charset=utf-8' );
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
//给图片添加水印
Class Water{
//开启水印
private $watermark_on = '1' ;
public $water_img ;
//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;
//水印文字
$text = $text ? $text : $this ->text;
$img_info = getimagesize ( $img );
$img_w = $img_info [0];
$img_h = $img_info [1];
//判断水印图片的类型
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 = imagettfbbox( $this ->size, 0, $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 );
}
//写入图片资源
if ( $waterimg_on ){
imagecopymerge( $res_img , $w_img , $x , $y , 0, 0, $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, 0, $x , $y , $color , $this ->font, $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 );
}
}
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2. test1.php
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<?php
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, 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);
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3.效果图
以上就是本文的全部内容,希望对大家学习PHP程序设计有所帮助。