PHPはGDライブラリのサムネイルに基づいてコードを生成します(jpg、gif、pngフォーマットに対応します)。
相変わらず、直接コードを入れます。
<?php
/**
* , :
*/
$newimage=new ImageResize();
$newimage->resize("tu.jpg","tu_lit.jpg",1000,1000);
echo $newimage->GetLastError();
class ImageResize{
private $localimage;//
private $remoteimage;//
private $localinfo;//
private $error;
function resize($localimg, $remoteimg, $x, $y) {
// gd
if(!$this->_checkenv()){
return false;
}
$this->localimage = $localimg;
$this->remoteimage = $remoteimg;
$this->localinfo = getimagesize($this->localimage); //
return $this->_resize($x,$y);
}
/**
* GD
*/
private function _checkenv(){
if(!function_exists('gd_info')){
$this->error[]=" GD , GD PHP ";
return false;
}
return true;
}
/**
*
* @param int $x
* @param int $y
* @return boolean
*/
private function _resize($x,$y){
if(!$this->localinfo){
$this->error[]=" ";
return false;
}
//
$im=@$this->_create($this->localinfo[2]);
if(!$im){
$this->error[]=" GD :{$this->localinfo['mime']}";
return false;
}
$dstsize=$this->_dstsize($x, $y);
$dstim=@imagecreatetruecolor($dstsize["width"],$dstsize["height"]);
$whitecolor=@imagecolorallocatealpha($dstim, 0, 0, 0,127);
imagefill($dstim,0,0,$whitecolor);
$re=@imagecopyresampled($dstim, $im, 0, 0, 0, 0, $dstsize["width"], $dstsize["height"], $this->localinfo[0], $this->localinfo[1]);
if(!$re){
$this->error[]=" ";
return false;
}
if(!imagejpeg($dstim, $this->remoteimage)){
if(!imagepng($dstim,$this->remoteimage)){
if(!imagegif($dstim,$this->remoteimage)){
$this->error[]=" {$this->remoteimage} , gd 。";
return false;
}
}
}
$this->error[]="success";
return true;
}
/**
* ,
* @param $code
* @return resource/boolean resourse false
*/
private function _create($code){
$src=$this->localimage;
switch ($code){
case 1:
return imagecreatefromgif($src);
break;
case 2:
return imagecreatefromjpeg($src);
break;
case 3:
return imagecreatefrompng($src);
break;
default :
return false;
break;
}
}
/**
*
* @param int $x
* @param int $y
* @return array
*/
private function _dstsize($x,$y){
list($srcwidth,$srcheight)=$this->localinfo;
if(($srcwidth/$srcheight)<($x/$y)){
$x=floor($y*$srcwidth/$srcheight);
}else{
$y=floor($x*$srcheight/$srcwidth);
}
$dstsize["width"]=$x;
$dstsize["height"]=$y;
return $dstsize;
}
/**
*
* return string
*/
function GetLastError(){
return array_pop($this->error);
}
/**
*
* return array
*/
function GetAllError(){
return $this->error;
}
}