本文實例為大家分享了php水印和縮略圖制作代碼，使用面向對象的方法來實現常見圖片格式jpg，png，gif的水印和縮略圖的制作，供大家參考，具體內容如下
<?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. *///給圖片添加水印Class Water{ //開啟水印 private $watermark_on = '1'; public $water_img; //水印位置 public $pos = 1; //壓縮比 public $pct = 80; //透明度 public $quality = 80; public $text = '樂趣網zlblog.sinaapp.com'; public $size = 12; public $color = '#000000'; public $font = 'font.ttf'; //thumb的制作 //默認縮略圖功能開啟 private $thumb_on = 1; //生成縮略圖的方式 public $thumb_type = 1; //生成縮略圖的寬度 public $thumb_width; //生成縮略圖的高度 public $thumb_height; //生成縮略圖的后綴名 public $thumb_fix = '_dq'; //縮略圖函數處理 public function thumb( $img,$outfile='',$t_type='',$t_w='',$t_h='' ){ //驗證圖片是否符合要求 if(!$this->check($img) || !$this->thumb_on) return FALSE; //定義縮略圖的初始值 $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; //獲取到原圖的信息 $img_info = getimagesize($img); $img_w = $img_info[0]; $img_h = $img_info[1]; //取得圖像類型的文件后綴 $img_type = image_type_to_extension($img_info[2]); //獲取到相關尺寸 $thumb_size = $this->thumb_size($img_w,$img_h,$t_w,$t_h,$t_type); //確定原始圖像類型 //利用自定義函數來實現圖片類型的確定 $func = "imagecreatefrom".substr($img_type, 1); $res_img = $func($img); //縮略圖資源 編輯圖片資源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], $thumb_size[1]); } //制作縮略圖 if(function_exists( "imagecopyresampled" ) ){ imagecopyresampled($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]); } //處理透明色 if( $img_type =='.gif' || $img_type == '.png' ){ imagecolortransparent($res_thumb,$color); } //配置輸出文件名 $outfile = $outfile ? $outfile : $outfile.substr($img,0,strripos($img,'.')).$this->thumb_fix.$img_type; //文件的保存輸出 $func = "image".substr($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; //水印的開啟狀態 $waterimg_on = $this->check($water_img) ? 1 : 0; //判斷是否在原圖上操作 $out_img = $out_img ? $out_img : $img; //判斷水印的位置 $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]; //判斷水印圖片的類型 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]; } //建立原圖資源 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; } //確定水印的位置 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); } //寫入圖片資源 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); } //生成圖片類型 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($w_img); return TRUE;} //驗證圖片是否存在 private function check($img){ $type = array('.jpg','.jpeg','.png','.gif'); $img_type = strtolower(strrchr($img, '.')); return extension_loaded('gd') && file_exists($img) && in_array($img_type, $type); } //獲取縮略圖的相關比例 //獲取到圖片的處理類型 private function thumb_size( $img_w,$img_h,$t_w,$t_h,$t_type){ //定義縮略圖尺寸 $w = $t_w; $h = $t_h; //定義圖片的原始尺寸 $cut_w = $img_w; $cut_h = $img_h; //當要目標圖像小于縮略圖的尺寸時； 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 ){ //當寬度固定時 case 1: $h = $t_w/$img_w*$img_h; break; //高度固定時 case 2: $w = $t_h/$img_h*$img_w; break; //寬度固定，高度裁切 case 3: $cut_h = $img_w/$t_w*$t_h; break; //高度固定，寬度裁切 case 4: $cut_w = $img_h/$t_h*$t_w; break; //等比例縮放 default : if( ($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內容，希望對大家學習PHP程序設計有所幫助。
