如何制作不同尺寸/尺寸的单个图像
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【中文标题】如何制作不同尺寸/尺寸的单个图像【英文标题】：How to make single image in different dimentions / size 【发布时间】：2017-03-25 06:48:17 【问题描述】：实际上，我想要这样，当我上传 1 张图片时，原始图片将存储在 upload/og/ 中。但我也想要不同尺寸的图像，如1366x768、1280*600、768x1024 等......不仅仅是这些尺寸，它将与该图像成比例。
我有一个代码，可以将该图像转换为带有比例的拇指，这适用于max-width=300 和max-height=600。
define ("MAX_SIZE","100");
define ("WIDTH","300");
define ("HEIGHT","600");
function make_thumb($img_name,$filename,$new_w,$new_h)
$ext=getExtension($img_name);
if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext))
$src_img=imagecreatefromjpeg($img_name);
if(!strcmp("png",$ext))
$src_img=imagecreatefrompng($img_name);
//gets the dimmensions of the image
$old_x=imageSX($src_img);
$old_y=imageSY($src_img);
// next we will calculate the new dimmensions for the thumbnail image
$ratio1=$old_x/$new_w;
$ratio2=$old_y/$new_h;
if($ratio1>$ratio2)
$thumb_w=$new_w;
$thumb_h=$old_y/$ratio1;
else
$thumb_h=$new_h;
$thumb_w=$old_x/$ratio2;
$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); // resize the big image to the new created one
if(!strcmp("png",$ext)) // output the created image to the file. Now we will have the thumbnail into the file named by $filename
imagepng($dst_img,$filename);
else
imagejpeg($dst_img,$filename);
imagedestroy($dst_img);
imagedestroy($src_img);
function getExtension($str)
$i = strrpos($str,".");
if (!$i) return "";
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
$errors=0;
if(isset($_POST['submit']))
//reads the name of the file the user submitted for uploading
$image=$_FILES['scrnsots']['name'];
if ($image)
$filename = stripslashes($_FILES['scrnsots']['name']);
// get the extension of the file in a lower case format
$extension = getExtension($filename);
$extension = strtolower($extension);
// if it is not a known extension, we will suppose it is an error, print an error message
//and will not upload the file, otherwise we continue
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png"))
echo '<h1>Unknown extension!</h1>';
$errors=1;
else
$size=getimagesize($_FILES['scrnsots']['tmp_name']);
$sizekb=filesize($_FILES['scrnsots']['tmp_name']);
if ($sizekb > MAX_SIZE*102400)
echo '<h1>You have exceeded the size limit!</h1>';
$errors=1;
$image_name= $image .''. time() .'.'.$extension;
$newname="uploads/scrnsots/".$image_name;
$copied = copy($_FILES['scrnsots']['tmp_name'], $newname);
if (!$copied)
echo '<h1>Copy unsuccessfull!</h1>';
$errors=1;
else
$thumb_name='uploads/scrnsots/thumb/thumb-'.$image_name;
$thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT);
if(isset($_POST['submit']) && !$errors)
echo $thumb_name ."<br/>";
echo "<div class='custom alert alert-success'>Successfully Added.<a href='#' class='close' data-dismiss='alert' aria-label='close'>×</a></div>";
但它只会创建拇指。我想要 1 张不同的图像 - 尺寸（高度 - 宽度）。
【问题讨论】：
你有没有试过把这个函数放在一个循环中，以适当的大小作为参数，它应该按照你的要求做。 对不起，兄弟。我对php没有足够的了解。但我想制作像hdwallpapers.in/2017_wonder_woman_movie-wallpapers.html 这样的网站 【参考方案1】：正如评论的那样，您实际上只需将最后一部分（函数）放在一个循环中，并使用mkdir() 添加一些目录创建逻辑。还有一个本机函数可以提取名为pathinfo() 的扩展名，因此只需使用该扩展名即可：
function make_thumb($img_name,$filename,$new_w,$new_h)
$ext=getExtension($img_name);
if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext))
$src_img=imagecreatefromjpeg($img_name);
if(!strcmp("png",$ext))
$src_img=imagecreatefrompng($img_name);
$old_x=imageSX($src_img);
$old_y=imageSY($src_img);
$ratio1=$old_x/$new_w;
$ratio2=$old_y/$new_h;
if($ratio1>$ratio2)
$thumb_w=$new_w;
$thumb_h=$old_y/$ratio1;
else
$thumb_h=$new_h;
$thumb_w=$old_x/$ratio2;
$dst_img = ImageCreateTrueColor($thumb_w,$thumb_h);
imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); // resize the big image to the new created one
if(!strcmp("png",$ext)) // output the created image to the file. Now we will have the thumbnail into the file named by $filename
imagepng($dst_img,$filename);
else
imagejpeg($dst_img,$filename);
imagedestroy($dst_img);
imagedestroy($src_img);
if(!empty($_FILES))
$errors=0;
if($_POST['submit'])
if($_FILES['scrnsots']['error'] == 0)
$image = $_FILES['scrnsots']['name'];
$filename = stripslashes($_FILES['scrnsots']['name']);
$extension = pathinfo($filename,PATHINFO_EXTENSION);
$extension = strtolower($extension);
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png"))
echo '<h1>Unknown extension!</h1>';
$errors=1;
else
$size = getimagesize($_FILES['scrnsots']['tmp_name']);
$sizekb = filesize($_FILES['scrnsots']['tmp_name']);
if ($sizekb > MAX_SIZE*102400)
echo '<h1>You have exceeded the size limit!</h1>';
$errors=1;
$image_name = $image.''.time().'.'.$extension;
$newname = __DIR__."/uploads/scrnsots/".$image_name;
$basepath = pathinfo($newname,PATHINFO_DIRNAME);
# Create the folder if not already made
if(!is_dir($basepath))
mkdir($basepath,0755,true);
# It's more common to use this function here instead of copy()
if (!move_uploaded_file($_FILES['scrnsots']['tmp_name'], $newname))
echo '<h1>Copy unsuccessfull!</h1>';
$errors=1;
else
# Have your sizes here
$sizes = array(
array(1366,768),
array(1280,600),
array(768,1024)
);
# Loop through your sizes here and apply your function
foreach($sizes as $hw)
$thumb_name = __DIR__.'/uploads/scrnsots/thumb/'.$hw[0].$hw[1].'/thumb-'.$image_name;
$thumb_path = pathinfo($thumb_name,PATHINFO_DIRNAME);
# Create the thumbnail directory(s) if not exist
if(!is_dir($thumb_path))
mkdir($thumb_path,0755,true);
# Run your function
make_thumb($newname,$thumb_name,$hw[0],$hw[1]);
【讨论】：
【参考方案2】：经过这么多尝试，我找到了答案。通过更改以下行中的一些内容
else
$thumb_name='uploads/scrnsots/thumb/thumb-'.$image_name;
$thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT);
到
else
$cars = array("300", "800", "1280","1366","1920");
$arrlength = count($cars);
for($x = 0; $x < $arrlength; $x++)
echo $cars[$x];
$thumb_name='uploads/scrnsots/'.$cars[$x].'/thumb-'.$image_name_dash;
$thumb=make_thumb($newname,$thumb_name,$cars[$x],$cars[$x]);
list($width_main, $height_main, $type, $attr) = getimagesize($newname);
list($og_image_w, $og_image_h, $type, $attr) = getimagesize("$thumb_name");
echo "<br>";
它有效。完美。
这个想法来自
http://www.w3schools.com/php/php_arrays.asp
我只是在名为"300", "800", "1280","1366","1920" 的目标路径中创建了 5 个文件夹。
然后，它完美地在特定文件夹中生成特定图像。 说真的，我很高兴。
【讨论】：
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