图片重取样

header("Content-type: image/jpeg");

$file = "10k.jpg";

$percent = 1.5;  //图片压缩比

list($width, $height) = getimagesize($file); //获取原图尺寸

//缩放尺寸

$newwidth = $width * $percent;

$newheight = $height * $percent;

$src_im = imagecreatefromjpeg($file);

$dst_im = imagecreatetruecolor($newwidth, $newheight);

imagecopyresized($dst_im, $src_im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

imagejpeg($dst_im); //输出压缩后的图片

imagedestroy($dst_im);

imagedestroy($src_im);