Home  >  Article  >  Backend Development  >  PHP implements watermark and thumbnail production of common image formats (object-oriented), _PHP tutorial

PHP implements watermark and thumbnail production of common image formats (object-oriented), _PHP tutorial

WBOY
WBOYOriginal
2016-07-12 08:49:40884browse

php implements watermark and thumbnail production of common image formats (object-oriented),

The example in this article shares the php watermark and thumbnail production code for everyone, using the object-oriented method To realize the production of watermarks and thumbnails of common image formats jpg, png, and gif for your reference, the specific content is as follows

<&#63;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';
  
 //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 &#63; $t_type : $this->thumb_type;
  $t_w = $t_w &#63; $t_w : $this->thumb_width;
  $t_h = $t_h &#63; $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 &#63; $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 &#63; $water_img : $this->water_img;
  //水印的开启状态
  $waterimg_on = $this->check($water_img) &#63; 1 : 0;
  //判断是否在原图上操作
  $out_img = $out_img &#63; $out_img : $img;
  //判断水印的位置
  $pos = $pos &#63; $pos : $this->pos;
  //水印文字
  $text = $text &#63; $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;
 }
}

The above is the entire content of this article. I hope it will be helpful to everyone in learning PHP programming.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1136638.htmlTechArticlephp implements watermark and thumbnail production of common image formats (object-oriented). This article shares the php watermark with everyone. and thumbnail production code, using object-oriented methods to implement common images...
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn