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PHP批量生成图片缩略图的方法,
Home Backend Development PHP Tutorial How to batch generate image thumbnails in PHP, _PHP tutorial

How to batch generate image thumbnails in PHP, _PHP tutorial

Jul 13, 2016 am 09:49 AM
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PHP批量生成图片缩略图的方法,

本文实例讲述了PHP批量生成图片缩略图的方法。分享给大家供大家参考。具体如下:

<&#63;php
//用PHP批量生成图片缩略图
 function mkdirs($dirname,$mode=0777)
 //创建目录(目录, [模式])
 {
  if(!is_dir($dirname))
  {
   mkdirs($dirname,$mode); //如果目录不存在,递归建立
   return mkdir($dirname,$mode);
  }
  return true;
 }
 function savefile($filename,$content='')
 //保存文件(文件, [内容])
 {
  if(function_exists(file_put_contents))
  {
   file_put_contents($filename,$content);
  }
  else
  {
   $fp=fopen($filename,"wb");
   fwrite($fp,$content);
   fclose($fp);
  }
 }
 function getsuffix($filename) //获取文件名后缀
 {
  return end(explode(".",$filename));
 }
 function checksuffix($filename,$arr) //是否为允许类型(当前, 允许)
 {
  if(!is_array($arr))
  {
   $arr=explode(",",str_replace(" ","",$arr));
  }
  return in_array($filename,$arr) &#63; 1 : 0;
 }
 class image
 {
  var $src; //源地址
  var $newsrc; //新图路径(本地化后)
  var $allowtype=array(".gif",".jpg",".png",".jpeg"); //允许的图片类型
  var $regif=0; //是否缩略GIF, 为0不处理
  var $keep=0; //是否保留源文件(1为保留, 0为MD5)
  var $over=0; //是否可以覆盖已存在的图片,为0则不可覆盖
  var $dir; //图片源目录
  var $newdir; //处理后的目录
  function __construct($olddir=null,$newdir=null)
  {
   $this->dir=$olddir &#63; $olddir : "./images/temp";
   $this->newdir=$newdir &#63; $newdir : "./images/s";
  }
  function reNames($src)
  {
   $md5file=substr(md5($src),10,10).strrchr($src,".");
   //MD5文件名后(例如:3293okoe.gif)
   $md5file=$this->w."_".$this->h."_".$md5file;
   //处理后文件名
   return $this->newdir."/".$md5file;
   //将源图片,MD5文件名后保存到新的目录里
  }
  function Mini($src,$w,$h,$q=80)
  //生成缩略图 Mini(图片地址, 宽度, 高度, 质量)
  {
   $this->src=$src;
   $this->w=$w;
   $this->h=$h;
   if(strrchr($src,".")==".gif" && $this->regif==0)
   //是否处理GIF图
   {
    return $this->src;
   }
   if($this->keep==0) //是否保留源文件,默认不保留
   {
    $newsrc=$this->reNames($src); //改名后的文件地址
   }
   else     //保持原名
   {
    $src=str_replace("\\","/",$src);
    $newsrc=$this->newdir.strrchr($src,"/");
   }
   if(file_exists($newsrc) && $this->over==0)
   //如果已存在,直接返回地址
   {
    return $newsrc;
   }
   if(strstr($src,"http://") && !strstr($src,$_SERVER['HTTP_HOST']))
   //如果是网络文件,先保存
   {
    $src=$this->getimg($src);
   }
   $arr=getimagesize($src); //获取图片属性
   $width=$arr[0];
   $height=$arr[1];
   $type=$arr[2];
   switch($type)
   {
    case 1:  //1 = GIF,
     $im=imagecreatefromgif($src);
     break;
    case 2:  //2 = JPG
     $im=imagecreatefromjpeg($src);
     break;
    case 3:  //3 = PNG
     $im=imagecreatefrompng($src);
     break;
    default:
     return 0;
   }
   //处理缩略图
   $nim=imagecreatetruecolor($w,$h);
   $k1=round($h/$w,2);
   $k2=round($height/$width,2);
   if($k1<$k2)
   {
    $width_a=$width;
    $height_a=round($width*$k1);
    $sw=0;
    $sh=($height-$height_a)/2;
   }
   else
   {
     $width_a=$height/$k1;
     $height_a=$height;
     $sw=($width-$width_a)/2;
     $sh = 0;
   }
   //生成图片
   if(function_exists(imagecopyresampled))
   {
    imagecopyresampled($nim,$im,0,0,$sw,$sh,$w,$h,$width_a,$height_a);
   }
   else
   {
    imagecopyresized($nim,$im,0,0,$sw,$sh,$w,$h,$width_a,$height_a);
   }
   if(!is_dir($this->newdir))
   {
    mkdir($this->newdir);
   }
   switch($type)  //保存图片
   {
    case 1:
     $rs=imagegif($nim,$newsrc);
     break;
    case 2:
     $rs=imagejpeg($nim,$newsrc,$q);
     break;
    case 3:
     $rs=imagepng($nim,$newsrc);
     break;
    default:
     return 0;
   }
   return $newsrc; //返回处理后路径
  }
  function getimg($filename)
  {
   $md5file=$this->dir."/".substr(md5($filename),10,10).strrchr($filename,".");
   if(file_exists($md5file))
   {
    return $md5file;
   }
   //开始获取文件,并返回新路径
   $img=file_get_contents($filename);
   if($img)
   {
    if(!is_dir($this->dir))
    {
     mkdir($this->dir);
    }
    savefile($md5file,$img);
    return $md5file;
   }
  }
  function reImg($src,$w,$h,$q)
  //转换缩略图(文件名和结构不变)
  {
   $this->keep=1;
   return $this->Mini($src,$w,$h,$q);
   //return 生成的地址
  }
 }
 $image=new image();
 echo $image->reImg("images/zht.jpg",75,75,80);
 echo "<br/>";
 echo $image->reImg("images/m8920.jpg",75,75,80);
 echo "<br/>";
 echo $image->getimg("./images/s/zht.jpg");
&#63;>

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希望本文所述对大家的php程序设计有所帮助。

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/1019063.htmlTechArticlePHP批量生成图片缩略图的方法, 本文实例讲述了PHP批量生成图片缩略图的方法。分享给大家供大家参考。具体如下: php//用PHP批量生成图片...
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