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Jul 13, 2016 am 09:50 AM

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How to batch generate image thumbnails in PHP

This article describes the method of batch generating image thumbnails in PHP. Share it with everyone for your reference. The details are as follows:

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//Use PHP to batch generate image thumbnails

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 image 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 keeping, 0 means MD5)

var $over=0; //Whether existing pictures can be overwritten, if it is 0, it cannot be 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,".");

//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 (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 images

{

return $this->src;

}

if($this->keep==0) //Whether to keep the source file, not kept by default

{

$newsrc=$this->reNames($src); //Renamed file address

}

else //Keep 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

{

$width_a=$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");

希望本文所述对大家的php程序设计有所帮助。

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