Welcome 微信登录

首页 / 网页编程 / PHP / php实现常见图片格式的水印和缩略图制作(面向对象)

本文实例为大家分享了php水印和缩略图制作代码,使用面向对象的方法来实现常见图片格式jpg,png,gif的水印和缩略图的制作,供大家参考,具体内容如下
<?phpheader("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"; //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moonif( $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; }}
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。