PHP imagecreatefromjpeg有效,为什么png / bmp / gif没有工作? [英] PHP imagecreatefromjpeg works, so why doesn't png/bmp/gif work?
问题描述
我想上传和调整不同扩展名的图片。 php从原始图片的中心裁剪出最大可能的正方形,然后将其保存为360 * 360像素。
I want to upload and resize pictures with different extensions. The php crops the biggest possible square from the center of the original pic, then saves it in 360*360 pixels.
代码适用于jpeg文件,但是使用gif,bmp和png我得到一个33字节大小的损坏文件。
The code works fine with jpeg files, but with gif, bmp and png I get a corrupted file with 33 Byte size.
以下是大部分代码:
$file_temp = $_FILES["pic"]["tmp_name"];
list ($width, $height, $type) = getimagesize ($file_temp);
$picture_name = "... a name.ext ...";
$upload = "... some dir/$picture_name";
if (move_uploaded_file($file_temp, "$upload"))
{
//switches content-type and calls the imagecreatefrom... function
if ($type == 1)
{
header ('Content-Type: image/gif');
$image = imagecreatefromgif($upload);
}
elseif ($type == 2)
{
header ('Content-Type: image/jpeg');
$image = imagecreatefromjpeg($upload);
}
elseif ($type == 3)
{
header ('Content-Type: image/png');
$image = imagecreatefrompng($upload);
}
else
{
header ('Content-Type: image/x-ms-bmp');
$image = imagecreatefromwbmp($upload);
}
$image_p = imagecreatetruecolor(360, 360);
//this code below should preserve transparency but I couldn't try it out for now...
if($type==1 or $type==3)
{
imagecolortransparent($image_p, imagecolorallocatealpha($image_p, 0, 0, 0, 127));
imagealphablending($image_p, true);
imagesavealpha($image_p, true);
}
//this part is for cropping
$x=0;
$y=0;
if ($width > $height)
{
$x= ($width - $height)/2;
$width = $height;
}
else
{
$y = ($height - $width)/2;
$height = $width;
}
imagecopyresampled ($image_p, $image, 0, 0, $x, $y, 360, 360, $width, $height);
if ($type == 1)
imagegif ($image_p, $upload, 80);
elseif ($type == 2)
imagejpeg ($image_p, $upload, 80);
elseif ($type == 3)
imagepng ($image_p, $upload, 80);
else
imagewbmp ($image_p, $upload, 80);
}
因此,只有正确处理jpeg文件,gif,png和bmp文件都没有T。我没有想法...
提前致谢!
So, only jpeg files are processed correctly, gif, png and bmp files aren't. I'm out of ideas...
Thanks in advance!
推荐答案
您的PHP可能不是编译时支持这些格式。运行phpinfo()并检查输出,如下所示:
Your PHP may not be compiled with support for those formats. Run a phpinfo() and inspect the output for something like this:
GD Support => enabled
GD Version => bundled (2.0.34 compatible)
GIF Read Support => enabled
GIF Create Support => enabled
PNG Support => enabled
libPNG Version => 1.2.10
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