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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<?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'; 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, $type); } } |
2. test1.php
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<?php /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. *///header('Content-Type:text/html;charset=utf-8');include 'water.class.php';$image = new Water();$image->watermark('12.jpg',5);//$image->watermark('12.jpg',1); |
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。
