$ext = strtolower ( pathinfo ( $src, 4 ) );
if ($imageinfos [2] == 1) {
$im = imagecreatefromgif ( $src );
} elseif ($imageinfos [2] == 2) {
$im = imagecreatefromjpeg ( $src );
} elseif ($imageinfos [2] == 3) {
$im = imagecreatefrompng ( $src );
}
if (isset ( $im )) {
$height = $imageinfos [1] * $width / $imageinfos [0];
$dst_img = ImageCreateTrueColor ( $width, $height );
imagesavealpha ( $dst_img, true );
$trans_colour = imagecolorallocatealpha ( $dst_img, 0, 0, 0, 127 );
imagefill ( $dst_img, 0, 0, $trans_colour );
imagecopyresampled ( $dst_img, $im, 0, 0, 0, 0, $width, $height, $imageinfos [0], $imageinfos [1] );
header ( 'content-type:image/jpg' );
imagejpeg ( $dst_img, null, 90 );//输出文件流,90--压缩质量,100表示最高质量。
@imagedestroy ( $im );
@imagedestroy ( $dst_img );
} else {
echo @file_get_contents ( $src );
}
$content = ob_get_contents ();//获取输出流
ob_end_flush ();//输出流到网页,保证第一次请求也有图片数据放回
@file_put_contents ( $des, $content );//保存文件
}
?>
效果图:








