blocks|key|3461202|text|check+timthumb.php很容易使用，你可以找到完整的教育代码|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3461203|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/timthumb/^0|6|C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

check <a href="http://code.google.com/p/timthumb/" rel="nofollow">timthumb.php</a> is easy to use and you can find the code full educational

blocks|key|2711974|text|如果你想调整图像的大小，你应该在客户端进行，因为PHP图像操作占用了大量的内存和CPU时间，而且不需要在服务器端完成(不需要访问db，不需要访问session等)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2711975|如果您仍然希望在PHP上执行此操作，则可以使用这些函数来获得正确的大小：|2711976|list($realW,+$realH)+=+getimagesize($source_image);

$realR+=+$realW+/+$realH;
$thumbR+=+$thumbW+/+$thumbH;

//+If+you+want+your+resize+image+to+fit+inside+the+max+thumb+size+:

if($realR+>+$thumbR)+//+Real+image+if+flatter+than+thumb
{
++++$newW+=+$thumbW;
++++$newH+=+$newW+/+$realR;
}
else
{
++++$newH+=+$thumbH;
++++$newW+=+$newH+*+$realR;
}

//+Or+if+you+want+your+resize+image+to+be+as+small+as+possible+but
//+not+smaller+than+your+thumb.+This+can+be+helpful+in+some+cases.

if($realR+<+$thumbR)
{
++++//+Same+code
}|code-block|syntax|javascript|2711977|然后像你做的那样使用复制重采样(如果你不能让它工作，请阅读php手册，下面有函数概要的例子)。|2711978|如果要使用javascript调整图像大小，可以使用<canvas>：|offset|length|style|CODE|2711979|var+canvas+=+document.createElement('canvas');
var+image+=+document.getElementById('image');
var+context+=+canvas.getContext('2d');
context.save();
context.drawImage(image,+/*+Here+you+put+the+right+values+using+the+algorithms+above+*/);
context.restore();
var+thumb+=+document.createElement('image');
thumb.src+=+canvas.toDataUrl();|2711980|或者类似的东西。根据您的具体情况，您可能会更改一些内容。|2711981|entityMap^0|0|0|0|0|Q|8|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@$M|11|N|12|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

If you want to resize an image, you should do it on client side because PHP image manipulation takes a lot of memory and CPU time, and it doesn't have to be done on server side (there are no access to db, no access to session, etc).

If you still want to do it on PHP, you can use that functions to get the right sizes :

<pre><code>list($realW, $realH) = getimagesize($source_image);

$realR = $realW / $realH;
$thumbR = $thumbW / $thumbH;

// If you want your resize image to fit inside the max thumb size :

if($realR &gt; $thumbR) // Real image if flatter than thumb
{
 $newW = $thumbW;
 $newH = $newW / $realR;
}
else
{
 $newH = $thumbH;
 $newW = $newH * $realR;
}

// Or if you want your resize image to be as small as possible but
// not smaller than your thumb. This can be helpful in some cases.

if($realR &lt; $thumbR)
{
 // Same code
}
</code></pre>

And then use copy resampled as you did (read php manual if you can't get it to work, there are examples below the synopsis of the function).

If you want to resize an image using javascript, you can use the <code>&lt;canvas&gt;</code> :

<pre><code>var canvas = document.createElement('canvas');
var image = document.getElementById('image');
var context = canvas.getContext('2d');
context.save();
context.drawImage(image, /* Here you put the right values using the algorithms above */);
context.restore();
var thumb = document.createElement('image');
thumb.src = canvas.toDataUrl();
</code></pre>

Or something like that. You may change a few things depending on your specific case.

blocks|key|2712001|text|请尝试使用以下代码，它将调整图像大小并创建新的缩略图。新尺寸定义为100+X+100。此示例还将保持图像的纵横比。注意：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2712002|1.如果要设置完整路径，镜像路径将为目录路径。2.在我们考虑的示例中，对于jpg文件，您可以使用for+PGN+&+GIF文件，其中imagecreatefrompng，imagecreatefromgif。3.这将创建PNG文件。|2712003|$_imagePath+=+'somefile.jpg';
$im+=+imagecreatefromjpeg($_imagePath);

imagealphablending($im,+true);

$_orgWidth+=+imagesx($im);
$_orgHeight+=++imagesy($im);

$_newWidth+=+100;
$_newHeight+=+100;

$_finalHeight+=+$_orgHeight+*+(+$_newWidth/+$_orgWidth);
++++if($_finalHeight+>+$_newHeight){
++++++++$_newWidth+=+$_orgWidth+*+($_newHeight+/+$_orgHeight);
++++}else{
++++++++$_newHeight+=+$_finalHeight+;
++++}


$_thumb+=+imagecreatetruecolor($_newWidth,+$_newHeight);
imagealphablending($_thumb,+true);
imagesavealpha($_thumb,+true);

imagecopyresampled($_thumb,+$im,+0,+0,+0,+0,+$_newWidth,+$_newHeight,+$_orgWidth+,+$_orgHeight++);

imagepng($_thumb,+'newname.png');
imagedestroy($_thumb);|code-block|syntax|javascript|2712004|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Please try with below code, It will resize image and create new thumbnail. New size is defined 100 X 100. This example will also keep aspected ratio of image.
Note: 

1.Image path will be directory path if want to set full path.
 2. In example we consider for jpg file, you can use for PGN &amp; GIF file with imagecreatefrompng, imagecreatefromgif.
 3.This will create PNG file.

<pre><code>$_imagePath = 'somefile.jpg';
$im = imagecreatefromjpeg($_imagePath);

imagealphablending($im, true);

$_orgWidth = imagesx($im);
$_orgHeight = imagesy($im);

$_newWidth = 100;
$_newHeight = 100;

$_finalHeight = $_orgHeight * ( $_newWidth/ $_orgWidth);
 if($_finalHeight &gt; $_newHeight){
 $_newWidth = $_orgWidth * ($_newHeight / $_orgHeight);
 }else{
 $_newHeight = $_finalHeight ;
 }


$_thumb = imagecreatetruecolor($_newWidth, $_newHeight);
imagealphablending($_thumb, true);
imagesavealpha($_thumb, true);

imagecopyresampled($_thumb, $im, 0, 0, 0, 0, $_newWidth, $_newHeight, $_orgWidth , $_orgHeight );

imagepng($_thumb, 'newname.png');
imagedestroy($_thumb);
</code></pre>

I am very new to Resize image in php.Basically i wanted to make thumbnail image using uploaded image. i have used below code but its not working, can anybody help me?..
Thanks in Advance...

<pre><code>$source_image = $path.$row-&gt;photosfolder;
$size = getimagesize($source_image);
$w = $size[0];
$h = $size[1];
$simg = imagecreatefromjpeg($source_image);
$dimg = imagecreatetruecolor(150, 225);
$wm = $w / 150;
$hm = $h / 225;
$h_height = 225 / 2;
$w_height = 150 / 2;

if ($w &gt; $h) {
 $temp = imagecopyresampled($dimg, $simg, 0, 0, 0, 0, 150, 225, $w, $h);
}
elseif (($w &lt; $h) || ($w == $h)) {
 $temp = imagecopyresampled($dimg, $simg, 0, 0, 0, 0, 150, 225, $w, $h);
}
else {
 $temp = imagecopyresampled($dimg, $simg, 0, 0, 0, 0, 150, 225, $w, $h);
}

$thumb_image = imagejpeg($dimg, $simg, 100);
</code></pre>

Image resize in PHP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我是一个非常新的在php.Basically中调整图像大小，我想使缩略图图像使用上传的图像。我已经使用了下面的代码，但它不工作，有人能帮助我吗？先谢谢你...$source_image = $path.$row->photosfolder;$size = getimagesize($source_image);$w =...

问在PHP中调整图像大小
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