How to generate thumbnail images in bulk in PHP

This article illustrates how to generate thumbnail images in batches in PHP. Share to everyone for your reference. as follows:

<?php
/ / Use PHP to generate image thumbnails in batches
 Function mkdirs($dirname,$mode=0777)
 / / Create a directory (directory, [mode])
 {
  If(!is_dir($dirname))
  {
   Mkdirs($dirname,$mode); //If the directory does not exist, recursively build
   Return mkdir($dirname,$mode);
  }
  Return true;
 }
 Function savefile($filename,$content='')
 / / Save the file (file, [content])
 {
  If(function_exists(file_put_contents))
  {
   File_put_contents($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,$arr) //whether it is allowed type (current, allowed)
 {
  If(!is_array($arr))
  {
   $arr=explode(",",str_replace(" ","",$arr));
  }
  Return in_array($filename,$arr) ? 1 : 0;
 }
 Class image
 {
  Var $src; //source address
  Var $newsrc; / / new map path (after localization)
  Var $allowtype=array(".gif",".jpg",".png",".jpeg"); //Allowed image types
  Var $regif=0; //whether abbreviated GIF, 0 is not processed
  Var $keep=0; // Whether to keep the source file (1 is reserved, 0 is MD5)
  Var $over=0; //Can you overwrite an existing image, 0 is not overwritten
  Var $dir; //image 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,".");
   / / MD5 file name (for example: 3293okoe.gif)
   $md5file=$this->w."_".$this->h."_".$md5file;
   / / File name after processing
   Return $this->newdir."/".$md5file;
   / / Save the source image, MD5 file name to a new directory
  }
  Function Mini($src,$w,$h,$q=80)
  //Generate thumbnail Mini (image address, width, height, quality)
  {
   $this->src=$src;
   $this->w=$w;
   $this->h=$h;
   If(strrchr($src,".")==".gif" && $this->regif==0)
   / / Whether to process GIF map
   {
    Return $this->src;
   }
   If($this->keep==0) // Whether to keep the source file, it is 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 directly to the address
   {
    Return $newsrc;
   }
   If(strstr($src,"http://") && !strstr($src,$_SERVER['HTTP_HOST']))
   / / If it is a network file, save 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;
   }
   / / Handle 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;
     $sh = 0;
   }
   //Generate image
   If(function_exists(imagecopyresampled))
   {
    Imagecopyresampled($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) //Save the image
   {
    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 $newsrc; / / return the processed path
  }
  Function getimg($filename)
  {
   $md5file=$this->dir."/".substr(md5($filename),10,10).strrchr($filename,".");
   If(file_exists($md5file))
   {
    Return $md5file;
   }
   / / Start to get the file and return a new path
   $img=file_get_contents($filename);
   If($img)
   {
    If(!is_dir($this->dir))
    {
     Mkdir($this->dir);
    }
    Savefile($md5file,$img);
    Return $md5file;
   }
  }
  Function reImg($src,$w,$h,$q)
  / / Convert thumbnails (file name and structure unchanged)
  {
   $this->keep=1;
   Return $this->Mini($src,$w,$h,$q);
   //return generated address
  }
 }
 $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");
?>

I hope this article will help you with your PHP programming.