php水印不生成图片格式,php实现常见图片格式的水印和缩略图制作(面向对象)

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//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';

//thumb的制作

//默认缩略图功能开启

private $thumb_on = 1;

//生成缩略图的方式

public $thumb_type = 1;

//生成缩略图的宽度

public $thumb_width;

//生成缩略图的高度

public $thumb_height;

//生成缩略图的后缀名

public $thumb_fix = '_dq';

//缩略图函数处理

public function thumb( $img,$outfile='',$t_type='',$t_w='',$t_h='' ){

//验证图片是否符合要求

if(!$this->check($img) || !$this->thumb_on) return FALSE;

//定义缩略图的初始值

$t_type = $t_type ? $t_type : $this->thumb_type;

$t_w = $t_w ? $t_w : $this->thumb_width;

$t_h = $t_h ? $t_h : $this->thumb_height;

//获取到原图的信息

$img_info = getimagesize($img);

$img_w = $img_info[0];

$img_h = $img_info[1];

//取得图像类型的文件后缀

$img_type = image_type_to_extension($img_info[2]);

//获取到相关尺寸

$thumb_size = $this->thumb_size($img_w,$img_h,$t_w,$t_h,$t_type);

//确定原始图像类型

//利用自定义函数来实现图片类型的确定

$func = "imagecreatefrom".substr($img_type, 1);

$res_img = $func($img);

//缩略图资源 编辑图片资源moon

if( $img_type == '.gif' || $img_type == '.png' ){

$res_thumb = imagecreate($thumb_size[0], $thumb_size[1]);

$color = imagecolorallocate($res_thumb, 255, 0, 0);

}else{

$res_thumb = imagecreatetruecolor($thumb_size[0], $thumb_size[1]);

}

//制作缩略图

if(function_exists( "imagecopyresampled" ) ){

imagecopyresampled($res_thumb, $res_img, 0, 0, 0, 0, $thumb_size[0],$thumb_size[1],$thumb_size[2],$thumb_size[3]);

}else{

imagecopyresized($res_thumb, $res_img, 0, 0, 0, 0, $thumb_size[0],$thumb_size[1],$thumb_size[2],$thumb_size[3]);

}

//处理透明色

if( $img_type =='.gif' || $img_type == '.png' ){

imagecolortransparent($res_thumb,$color);

}

//配置输出文件名

$outfile = $outfile ? $outfile : $outfile.substr($img,0,strripos($img,'.')).$this->thumb_fix.$img_type;

//文件的保存输出

$func = "image".substr($img_type, 1);

$func($res_thumb,$outfile);

if(isset($res_thumb)) imagedestroy ($res_thumb);

if(isset($res_img)) imagedestroy ($res_img);

return $outfile;

}

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:

imagepng($res_img,$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);

}

//获取缩略图的相关比例

//获取到图片的处理类型

private function thumb_size( $img_w,$img_h,$t_w,$t_h,$t_type){

//定义缩略图尺寸

$w = $t_w;

$h = $t_h;

//定义图片的原始尺寸

$cut_w = $img_w;

$cut_h = $img_h;

//当要目标图像小于缩略图的尺寸时；

if( $img_w <= $t_w && $img_h < $t_h ){

$w = $img_w;

$h = $img_h;

}else{

if( !empty($t_type) && $t_type>0 ){

switch ( $t_type ){

//当宽度固定时

case 1:

$h = $t_w/$img_w*$img_h;

break;

//高度固定时

case 2:

$w = $t_h/$img_h*$img_w;

break;

//宽度固定，高度裁切

case 3:

$cut_h = $img_w/$t_w*$t_h;

break;

//高度固定，宽度裁切

case 4:

$cut_w = $img_h/$t_h*$t_w;

break;

//等比例缩放

default :

if( ($img_w/$t_w) > ($img_h/$t_h) ){

$h = $t_w/$img_w*$t_h;

}elseif( ($img_w/$t_w) < ($img_h/$t_h) ){

$w = $t_h/$img_h*$t_w;

}else{

$w = $t_w;

$h = $t_h;

}

}

}

}

$arr[0] = $t_w;

$arr[1] = $t_h;

$arr[2] = $cut_w;

$arr[3] = $cut_h;

return $arr;

}

}