$fileurl="./images/";
$s_img=imagecreatefromjpeg($fileurl."1.jpg");
$m_img1=imagecreatetruecolor(500, 500); //固定大小的縮放
//假設現在是縮放成500*500
list($s_w,$s_h)=getimagesize($fileurl."1.jpg");
imagecopyresampled($m_img1,$s_img,0,0,0,0,500,500,$s_w,$s_h);
imagejpeg($m_img1,$fileurl."2.jpg");
imagedestroy($s_img);
imagedestroy($m_img1);