php 调整图像大小并使用 imagejpeg() 保存
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Resize an image and save with imagejpeg()
提问by Ponch0
iam trying to resize an imageto a thumbnail with php! I get no errors but it won't save the thumbnail on my server. The code is:
我正在尝试使用 php 将图像大小调整为缩略图！我没有收到任何错误，但它不会将缩略图保存在我的服务器上。代码是：
#Resize image
function resize($input_dir, $cur_file, $newwidth, $output_dir)
{
$filename = $input_dir.'/'.$cur_file;
$format='';
if(preg_match("/.jpg/i", $filename))
{
$format = 'image/jpeg';
}
if (preg_match("/.gif/i", $filename))
{
$format = 'image/gif';
}
if(preg_match("/.png/i", $filename))
{
$format = 'image/png';
}
if($format!='')
{
list($width, $height) = getimagesize($filename);
$newheight=$height*$newwidth/$width;
switch($format)
{
case 'image/jpeg':
$source = imagecreatefromjpeg($filename);
break;
case 'image/gif';
$source = imagecreatefromgif($filename);
break;
case 'image/png':
$source = imagecreatefrompng($filename);
break;
}
$thumb = imagecreatetruecolor($newwidth,$newheight);
imagealphablending($thumb, false);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
imagejpeg($thumb, 'thumb_'.$cur_file);
}
}
My function looks like:
我的功能看起来像：
resize(plugins_url().'/MyImagePlugin/img', 'testimg.jpg', "200");
The Image is in the Folder "img" in my Plugin Dic. The wired thing is ,that i don't get any erros?! CHMOD is 777 for img-folder.
图像位于我的插件 Dic 中的文件夹“img”中。有线的事情是，我没有得到任何错误？！img 文件夹的 CHMOD 为 777。
Any help would be appreciated.
任何帮助，将不胜感激。
回答by Ian Kenney
You are not using any path when you save the image in the line:
在行中保存图像时，您没有使用任何路径：
imagejpeg($thumb, 'thumb_'.$cur_file);
$cur_fileis set to testing.jpg.
$cur_file设置为 testing.jpg。
You should add the path to the filename or it will be attempoting to create it in whatever the current directory is.
您应该将路径添加到文件名，否则它将尝试在当前目录中的任何目录中创建它。
Changes are something like :
变化是这样的：
function resize($input_dir, $cur_file, $newwidth, $output_dir = "" )
{
if($output_dir == "") $output_dir = $input_dir;
.....
imagejpeg($thumb, $output_dir.'/thumb_'.$cur_file);
}
}
回答by lakshya_arora
I know that this is not your way of doing but iam sure it can help you.
我知道这不是你的方式，但我相信它可以帮助你。
if (isset($_FILES['image']['name']))
{
$saveto = "dirname/file.jpg";
move_uploaded_file($_FILES['image']['tmp_name'], $saveto);
$typeok = TRUE;
switch($_FILES['image']['type'])
{
case "image/gif": $src = imagecreatefromgif($saveto); break;
case "image/jpeg": // Both regular and progressive jpegs
case "image/pjpeg": $src = imagecreatefromjpeg($saveto); break;
case "image/png": $src = imagecreatefrompng($saveto); break;
default: $typeok = FALSE; break;
}
if ($typeok)
{
list($w, $h) = getimagesize($saveto);
$max = 500;
\ you can change this to desired product for height and width.
$tw = $w;
$th = $h;
if ($w > $h && $max < $w)
{
$th = $max / $w * $h;
$tw = $max;
}
elseif ($h > $w && $max < $h)
{
$tw = $max / $h * $w;
$th = $max;
}
elseif ($max < $w)
{
$tw = $th = $max;
}
$tmp = imagecreatetruecolor($tw, $th);
imagecopyresampled($tmp, $src, 0, 0, 0, 0, $tw, $th, $w, $h);
imageconvolution($tmp, array( // Sharpen image
array(-1, -1, -1),
array(-1, 16, -1),
array(-1, -1, -1)
), 8, 0);
imagejpeg($tmp, $saveto);
imagedestroy($tmp);
imagedestroy($src);
}
}
