[英]Crop resize images on the fly using PHP
I'm building a wallpaper website and therefore i need to be able to resize the original image before downloading. 我正在建立一个墙纸网站,因此在下载之前,我需要能够调整原始图像的大小。 I tried this code to resize the image:
我尝试使用以下代码来调整图像大小:
//resize and crop image by center
function resize_crop_image($max_width, $max_height, $source_file, $dst_dir, $quality = 80){
$imgsize = getimagesize($source_file);
$width = $imgsize[0];
$height = $imgsize[1];
$mime = $imgsize['mime'];
switch($mime){
case 'image/gif':
$image_create = "imagecreatefromgif";
$image = "imagegif";
break;
case 'image/png':
$image_create = "imagecreatefrompng";
$image = "imagepng";
$quality = 7;
break;
case 'image/jpeg':
$image_create = "imagecreatefromjpeg";
$image = "imagejpeg";
$quality = 80;
break;
default:
return false;
break;
}
$dst_img = imagecreatetruecolor($max_width, $max_height);
$src_img = $image_create($source_file);
$width_new = $height * $max_width / $max_height;
$height_new = $width * $max_height / $max_width;
//if the new width is greater than the actual width of the image, then the height is too large and the rest cut off, or vice versa
if($width_new > $width){
//cut point by height
$h_point = (($height - $height_new) / 2);
//copy image
imagecopyresampled($dst_img, $src_img, 0, 0, 0, $h_point, $max_width, $max_height, $width, $height_new);
}else{
//cut point by width
$w_point = (($width - $width_new) / 2);
imagecopyresampled($dst_img, $src_img, 0, 0, $w_point, 0, $max_width, $max_height, $width_new, $height);
}
$image($dst_img, $dst_dir, $quality);
if($dst_img)imagedestroy($dst_img);
if($src_img)imagedestroy($src_img);
}
And this will do the resize: 这将调整大小:
resize_crop_image($width, $height, $image_URL, $save_URL)
This code works fine for me but i want to ONLY send the output to user's browser, since saving thousands of extra images isn't possible. 这段代码对我来说很好用,但是我只想将输出发送到用户的浏览器,因为不可能保存成千上万的额外图像。 There are libraries i can use, but i don't want to use a third party snippet.
我可以使用某些库,但我不想使用第三方代码段。 Is there a way to alter this code in the way i desire?
有没有办法以我想要的方式更改此代码? Thanks.
谢谢。
For your $image function , do not specify a destination directory (null) and an image stream will be created. 对于$ image函数,请不要指定目标目录(空),否则将创建图像流。
header("Content-type:{$mime}");
That should send the image to the user 那应该将图像发送给用户
You just need to set the proper headers and echo the output. 您只需要设置适当的标题并回显输出即可。 Every PHP request "downloads a file" to the browser, more or less.
每个PHP请求或多或少都会“下载文件”到浏览器。 You just need to specify how the browser handles it.
您只需要指定浏览器如何处理它即可。 So try something like:
因此,尝试类似:
header("Content-Type: $mime");
header("Content-Disposition: attachment; filename=$dst_img");
echo $dst_img;
That should do it for you. 那应该为你做。
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