PHP提取第一张图片+生成缩略图+图片添加水印

来源：互联网发布：浦口行知基地编辑：程序博客网时间：2024/04/28 20:24

PHP获取网站文章的第一张图片

<?php //调用文章首张图片，如果文章没有图片就调用默认图片no-image.jpg$pattern="/<[img|IMG].*?src=[\'|\"](.*?(?:[\.gif|\.jpg|\.png]))[\'|\"].*?[\/]?>/"; $content = $article->Content; //文章内容 preg_match_all($pattern,$content,$matchContent); if(isset($matchContent[1][0])){       $temp=$matchContent[1][0]; }else{       $temp="./images/no-image.jpg";//在相应位置放置一张命名为no-image的jpg图片 }   ?>

PHP生成缩略图

function img_create_small($big_img, $width, $height, $small_img) {//原始大图地址，缩略图宽度，高度，缩略图地址$imgage = getimagesize($big_img); //得到原始大图片$src_W = $imgage[0]; //获取大图片宽度$src_H = $imgage[1]; //获取大图片高度$tn = imagecreatetruecolor($width, $height); //创建缩略图switch ($imgage[2]) { // 图像类型判断case 1:$im = imagecreatefromgif($big_img);break;case 2:$im = imagecreatefromjpeg($big_img);break;case 3:$im = imagecreatefrompng($big_img);break;}imagecopyresampled($tn, $im, 0, 0, 0, 0, $width, $height, $src_W, $src_H); //复制图像并改变大小imagejpeg($tn, $small_img); //输出图像}

PHP为图片添加水印（函数部分+调用部分）
这里写图片描述

/////////////////函数部分/////////////////////////////function imageWaterMark($groundImage,$waterPos=0,$waterImage=”",$waterText=”",$textFont=5,$textColor=”#FF0000″)     {       $isWaterImage = FALSE;       $formatMsg = “暂不支持该文件格式，请用图片处理软件将图片转换为GIF、JPG、PNG格式。”;       //读取水印文件       if(!emptyempty($waterImage) && file_exists($waterImage))       {         $isWaterImage = TRUE;         $water_info = getimagesize($waterImage);         $water_w   = $water_info[0];//取得水印图片的宽         $water_h   = $water_info[1];//取得水印图片的高         switch($water_info[2])//取得水印图片的格式         {             case 1:$water_im = imagecreatefromgif($waterImage);break;             case 2:$water_im = imagecreatefromjpeg($waterImage);break;             case 3:$water_im = imagecreatefrompng($waterImage);break;             default:die($formatMsg);         }       }       //读取背景图片       if(!emptyempty($groundImage) && file_exists($groundImage))       {         $ground_info = getimagesize($groundImage);         $ground_w   = $ground_info[0];//取得背景图片的宽         $ground_h   = $ground_info[1];//取得背景图片的高         switch($ground_info[2])//取得背景图片的格式         {             case 1:$ground_im = imagecreatefromgif($groundImage);break;             case 2:$ground_im = imagecreatefromjpeg($groundImage);break;             case 3:$ground_im = imagecreatefrompng($groundImage);break;             default:die($formatMsg);         }       }       else      {         die(”需要加水印的图片不存在！”);       }       //水印位置       if($isWaterImage)//图片水印       {         $w = $water_w;         $h = $water_h;         $label = “图片的”;       }       else//文字水印       {         $temp = imagettfbbox(ceil($textFont*5),0,”./cour.ttf”,$waterText);//取得使用 TrueType 字体的文本的范围         $w = $temp[2] - $temp[6];         $h = $temp[3] - $temp[7];         unset($temp);         $label = “文字区域”;       }       if( ($ground_w<$w) || ($ground_h<$h) )       {         echo “需要加水印的图片的长度或宽度比水印”.$label.”还小，无法生成水印！”;         return;       }       switch($waterPos)       {         case 0://随机             $posX = rand(0,($ground_w - $w));             $posY = rand(0,($ground_h - $h));             break;         case 1://1为顶端居左             $posX = 0;             $posY = 0;             break;         case 2://2为顶端居中             $posX = ($ground_w - $w) / 2;             $posY = 0;             break;         case 3://3为顶端居右             $posX = $ground_w - $w;             $posY = 0;             break;         case 4://4为中部居左             $posX = 0;             $posY = ($ground_h - $h) / 2;             break;         case 5://5为中部居中             $posX = ($ground_w - $w) / 2;             $posY = ($ground_h - $h) / 2;             break;         case 6://6为中部居右             $posX = $ground_w - $w;             $posY = ($ground_h - $h) / 2;             break;         case 7://7为底端居左             $posX = 0;             $posY = $ground_h - $h;             break;         case 8://8为底端居中             $posX = ($ground_w - $w) / 2;             $posY = $ground_h - $h;             break;         case 9://9为底端居右             $posX = $ground_w - $w;             $posY = $ground_h - $h;             break;         default://随机             $posX = rand(0,($ground_w - $w));             $posY = rand(0,($ground_h - $h));             break;         }       //设定图像的混色模式       imagealphablending($ground_im, true);       if($isWaterImage)//图片水印       {         imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷贝水印到目标文件             }       else//文字水印       {         if( !emptyempty($textColor) && (strlen($textColor)==7) )         {             $R = hexdec(substr($textColor,1,2));             $G = hexdec(substr($textColor,3,2));             $B = hexdec(substr($textColor,5));         }         else        {             die(”水印文字颜色格式不正确！”);         }         imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));             }       //生成水印后的图片       @unlink($groundImage);       switch($ground_info[2])//取得背景图片的格式       {         case 1:imagegif($ground_im,$groundImage);break;         case 2:imagejpeg($ground_im,$groundImage);break;         case 3:imagepng($ground_im,$groundImage);break;         default:die($errorMsg);       }       //释放内存       if(isset($water_info)) unset($water_info);       if(isset($water_im)) imagedestroy($water_im);       unset($ground_info);       imagedestroy($ground_im);     }

///////////////////////调用部分/////////////////<?php $id=$_REQUEST['id'];     $num = count($_FILES['userfile']['name']);     print_r($_FILES['userfile']);     print_r($_FILES['userfile']['name']);     echo $num;     echo "<br>";     if(isset($id)){      for($i=0;$i<$id;$i++){       if(isset($_FILES) && !emptyempty($_FILES['userfile']) && $_FILES['userfile']['size']>0){       $uploadfile = "./".time()."_".$_FILES['userfile'][name][$i];       echo "<br>";       echo $uploadfile;       if (copy($_FILES['userfile']['tmp_name'][$i], $uploadfile))       {         echo "OK<br>";         //文字水印         //imageWaterMark($uploadfile,5,”",”HTTP://www.lvye.info”,5,”#cccccc“);         //图片水印         $waterImage=”logo_ok1.gif”;//水印图片路径    imageWaterMark($uploadfile,9,$waterImage);         echo '<img src=\'".$uploadfile.'\' border=\”0\'>';       }       else      {         echo “Fail<br>';       }     }      }     }     ?>     <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>调用部分</title></head><form enctype="multipart/form-data" method="get"><?php for($a=0;$a<$id;$a++){  ?><input name="" type="file" name="userfile[]"/><?php } ?><input type=”submit” value=”上传”> </form><body></body></html>

http://www.jb51.net/article/84729.htm

http://blog.csdn.net/grtreexyz/article/details/49930469
https://my.oschina.net/bojinzhu/blog/49318（imagecopyresampled参数详解）

http://www.jb51.net/article/14104.htm
http://wenda.so.com/q/1366478313065883（enctype=”multipart/form-data”）
http://www.php100.com/cover/php/397.html（unlink 和unset区别）

0 0