[英]Create thumbnail after upload, PHP
I have implemented a file upload for pictures on my page, and tried to somehow generate thumbnails with the intention of clicking them to view via fancybox. 我已经为页面上的图片实现了文件上传,并尝试以某种方式生成缩略图,以便单击它们以通过fancybox进行查看。 The upload works but my function to create a thumbnail doesn't. 上传有效,但我创建缩略图的功能无效。 (This is included in my upload.php, right after "move_uploaded_file": (这是在“ move_uploaded_file”之后的我的upload.php中包含的:
<?php
$src = $subdir.$fileupload['name'];
function make_thumb($src)
{
$source_image = imagecreatefromjpeg($src); //For testing purposes only jpeg now
$width = imagesx($source_image);
$height = imagesy($source_image);
$desired_width = 220;
$desired_height = floor($height * ($desired_width / $width));
$virtual_image = imagecreatetruecolor($desired_width, $desired_height);
imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
header("Content-type: image/jpeg");
imagejpeg($virtual_image, realpath('./Thumbnails/filename.jpg')); //Temporary filename, will be changed
}
?>
Just FYI, this is an assignment and since I am a php beginner, I did use google, but can't find the problem in my case. 仅供参考,这是一项任务,由于我是php初学者,所以我确实使用过google,但在我的情况下找不到问题。 Maybe my understanding of php is lacking too much. 也许我对php的了解太少了。
Use this img_resize
function, it is good for the most popular image formats 使用此img_resize
函数,适用于最受欢迎的图像格式
function img_resize($src, $dest, $width, $height, $rgb = 0xFFFFFF, $quality = 100)
{
if (!file_exists($src))
return false;
$size = getimagesize($src);
if ($size === false)
return false;
$format = strtolower(substr($size['mime'], strpos($size['mime'], '/') + 1));
$icfunc = "imagecreatefrom" . $format;
if (!function_exists($icfunc))
return false;
$x_ratio = $width / $size[0];
$y_ratio = $height / $size[1];
$ratio = min($x_ratio, $y_ratio);
$use_x_ratio = ($x_ratio == $ratio);
$new_width = $use_x_ratio ? $width : floor($size[0] * $ratio);
$new_height = !$use_x_ratio ? $height : floor($size[1] * $ratio);
$new_left = $use_x_ratio ? 0 : floor(($width - $new_width) / 2);
$new_top = !$use_x_ratio ? 0 : floor(($height - $new_height) / 2);
$isrc = $icfunc($src);
$idest = imagecreatetruecolor($width, $height);
imagefill($idest, 0, 0, $rgb);
if (($format == 'gif') or ($format == 'png')) {
imagealphablending($idest, false);
imagesavealpha($idest, true);
}
if ($format == 'gif') {
$transparent = imagecolorallocatealpha($idest, 255, 255, 255, 127);
imagefilledrectangle($idest, 0, 0, $width, $height, $transparent);
imagecolortransparent($idest, $transparent);
}
imagecopyresampled($idest, $isrc, $new_left, $new_top, 0, 0, $new_width, $new_height, $size[0], $size[1]);
getResultImage($idest, $dest, $size['mime']);
imagedestroy($isrc);
imagedestroy($idest);
return true;
}
function getResultImage($dst_r, $dest_path, $type)
{
switch ($type) {
case 'image/jpg':
case 'image/jpeg':
case 'image/pjpeg':
return imagejpeg($dst_r, $dest_path, 90);
break;
case 'image/png';
return imagepng($dst_r, $dest_path, 2);
break;
case 'image/gif';
return imagegif($dst_r, $dest_path);
break;
default:
return;
}
}
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