Generate image thumbnails in batches with PHP

 function mkdirs($dirname,$mode=0777) //Create directory (directory, [mode])
 {
 if(!is_dir($ dirname))
 {
 mkdirs($dirname,$mode); //If the directory does not exist, create it recursively
 return mkdir($dirname,$mode);
 }
 return true;
 }

 function savefile($filename ,$content='') //Save file(file, [content])
 {
 if(function_exists(file_put_contents))
 {
 file_put_contents($filename,$content);
 }
 else
 {
 $fp= fopen($filename,"wb");
 fwrite($fp,$content);
 fclose($fp);
 }
 }

 function getsuffix($filename) //Get the file name suffix
 {
 return end (explode(".",$filename));
 }

 function checksuffix($filename,$arr) //Whether it is an allowed type (current, allowed)
 {
 if(!is_array($arr))
 {
 $arr=explode(",",str_replace(" ","",$arr));
 }
 return in_array($filename,$arr) ? 1 : 0;
 }

 class image
 {
 var $src; //Source address
 var $newsrc; //New picture path (after localization)
 var $allowtype=array(".gif",".jpg",".png",".jpeg"); //Allowed image types
 var $regif=0; //Whether to abbreviate GIF, if it is 0, it will not be processed
 var $keep=0; //Whether to keep the source file (1 means to keep, 0 means MD5)
 var $over =0; //Whether the existing picture can be overwritten, if it is 0, it cannot be overwritten
 var $dir; //Picture source directory
 var $newdir; //Processed directory

 function __construct($olddir=null,$ newdir=null)
 {
 $this->dir=$olddir ? $olddir : "./images/temp";
 $this->newdir=$newdir ? $newdir : "./images/s";
 }

 function reNames($src)
 {
 $md5file=substr(md5($src),10,10).strrchr($src,"."); //After the MD5 file name (for example: 3293okoe. gif)
 $md5file=$this->w."_".$this->h."_".$md5file; //Processed file name
 return $this->newdir."/". $md5file; //Save the source image and MD5 file name to a new directory
 }

 function Mini($src,$w,$h,$q=80) //Generate thumbnail Mini(picture address, width, height, quality)
 {
 $this->src=$src;
 $this->w=$w;
 $this->h=$h;
 if(strrchr($src," .")==".gif" && $this->regif==0) //Whether to process GIF images
 {
 return $this->src;
 }
 if($this->keep== 0) //Whether to retain the source file, not retained by default
 {
 $newsrc=$this->reNames($src); //Renamed file address
 }
 else //Keep the original name
 {
 $src= str_replace("\","/",$src);
 $newsrc=$this->newdir.strrchr($src,"/");
 }
 if(file_exists($newsrc) && $this-> ;over==0) //If it already exists, return the address directly
 {
 return $newsrc;
 }
 if(strstr($src,"http://") && !strstr($src,$_SERVER[' HTTP_HOST']))//If it is a network file, save it first
 {
 $src=$this->getimg($src);
 }
 $arr=getimagesize($src); //Get image attributes
 $ 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;
 }

 //Process thumbnails
 $nim=imagecreatetruecolor($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 "";
    echo $image->reImg("images/m8920.jpg",75,75,80);
    echo "";
    echo $image->getimg("./images/s/zht.jpg");
?>

PHP