blocks|key|657168|text|除非完成一个完整的HTTP请求，否则没有简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|657169|$img+=+get_headers("http://static.adzerk.net/Advertisers/2564.jpg",+1);
print+$img["Content-Length"];|code-block|syntax|javascript|657170|但是，您可以利用cURL发送lighter+HEAD+request+instead。|offset|length|style|CODE|657171|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/cURL|1|https://stackoverflow.com/questions/1378915/header-only-retreival-in-php-via-curl^0|0|0|8|4|M|4|8|4|0|E|S|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]]|9|@$I|13|J|14|1|15]|$I|16|J|17|1|18]]|A|$]]|$1|M|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]|U|$5|P|Q|R|A|$S|V]]]]

Short of doing a complete HTTP request, there is no easy way:

<pre><code>$img = get_headers("http://static.adzerk.net/Advertisers/2564.jpg", 1);
print $img["Content-Length"];
</code></pre>

You can likely utilize <a href="http://php.net/cURL" rel="noreferrer"><code>cURL</code></a> however to send a <a href="https://stackoverflow.com/questions/1378915/header-only-retreival-in-php-via-curl">lighter <code>HEAD</code> request instead</a>.

blocks|key|874330|text|<?php
$file_size+=+filesize($_SERVER['DOCUMENT_ROOT']."/Advertisers/2564.jpg");+//+Get+file+size+in+bytes
$file_size+=+$file_size+/+1024;+//+Get+file+size+in+KB
echo+$file_size;+//+Echo+file+size
?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|874331|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;?php
$file_size = filesize($_SERVER['DOCUMENT_ROOT']."/Advertisers/2564.jpg"); // Get file size in bytes
$file_size = $file_size / 1024; // Get file size in KB
echo $file_size; // Echo file size
?&gt;
</code></pre>

blocks|key|874469|text|不确定是否使用filesize()处理远程文件，但是关于使用cURL，在php.net上有一些很好的代码片段。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|874470|http://www.php.net/manual/en/function.filesize.php#92462|874471|entityMap|0|LINK|mutability|MUTABLE|url^0|7|A|0|0|1K|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@$9|S|A|T|1|U]]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|G]]]]

Not sure about using <code>filesize()</code> for remote files, but there are good snippets on php.net though about using cURL. 

<a href="http://www.php.net/manual/en/function.filesize.php#92462" rel="nofollow">http://www.php.net/manual/en/function.filesize.php#92462</a>

blocks|key|657035|text|这听起来像是权限问题，因为filesize()应该工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|657036|下面是一个示例：|657037|php+>+echo+filesize("./9832712.jpg");
1433719|code-block|syntax|javascript|657038|请确保正确设置了镜像上的权限，并且路径也正确。您需要应用一些数学运算来将字节转换为KB，但完成此操作后，您的状态应该会很好！|657039|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

That sounds like a permissions issue because filesize() should work just fine.

Here is an example:

<pre><code>php &gt; echo filesize("./9832712.jpg");
1433719
</code></pre>

Make sure the permissions are set correctly on the image and that the path is also correct. You will need to apply some math to convert from bytes to KB but after doing that you should be in good shape!

blocks|key|874375|text|这里有一个关于filesize()的链接|type|unstyled|depth|inlineStyleRanges|entityRanges|data|874376|不能使用filesize()检索远程文件信息。必须首先通过其他方法下载或确定|874377|在这里使用Curl是一个很好的方法：|874378|Tutorial|offset|length|874379|entityMap|0|LINK|mutability|MUTABLE|url|http://www.learnxpress.com/get-files-from-remote-file-size-with-php.html^0|0|0|0|0|8|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

Here is a good link regarding filesize()

You cannot use filesize() to retrieve remote file information. It must first be downloaded or determined by another method

Using Curl here is a good method:

<a href="http://www.learnxpress.com/get-files-from-remote-file-size-with-php.html" rel="nofollow">Tutorial</a>

blocks|key|657276|text|您还可以使用此函数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|657277|<?php
$filesize=file_get_size($dir.'/'.$ff);
$filesize=$filesize/1024;//+to+convert+in+KB
echo+$filesize;


function+file_get_size($file)+{
++++//open+file
++++$fh+=+fopen($file,+"r");
++++//declare+some+variables
++++$size+=+"0";
++++$char+=+"";
++++//set+file+pointer+to+0;+I'm+a+little+bit+paranoid,+you+can+remove+this
++++fseek($fh,+0,+SEEK_SET);
++++//set+multiplicator+to+zero
++++$count+=+0;
++++while+(true)+{
++++++++//jump+1+MB+forward+in+file
++++++++fseek($fh,+1048576,+SEEK_CUR);
++++++++//check+if+we+actually+left+the+file
++++++++if+(($char+=+fgetc($fh))+!==+false)+{
++++++++++++//if+not,+go+on
++++++++++++$count+%2B%2B;
++++++++}+else+{
++++++++++++//else+jump+back+where+we+were+before+leaving+and+exit+loop
++++++++++++fseek($fh,+-1048576,+SEEK_CUR);
++++++++++++break;
++++++++}
++++}
++++//we+could+make+$count+jumps,+so+the+file+is+at+least+$count+*+1.000001+MB+large
++++//1048577+because+we+jump+1+MB+and+fgetc+goes+1+B+forward+too
++++$size+=+bcmul("1048577",+$count);
++++//now+count+the+last+few+bytes;+they're+always+less+than+1048576+so+it's+quite+fast
++++$fine+=+0;
++++while(false+!==+($char+=+fgetc($fh)))+{
++++++++$fine+%2B%2B;
++++}
++++//and+add+them
++++$size+=+bcadd($size,+$fine);
++++fclose($fh);
++++return+$size;
}
?>|code-block|syntax|javascript|657278|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use also this function

<pre><code>&lt;?php
$filesize=file_get_size($dir.'/'.$ff);
$filesize=$filesize/1024;// to convert in KB
echo $filesize;


function file_get_size($file) {
 //open file
 $fh = fopen($file, "r");
 //declare some variables
 $size = "0";
 $char = "";
 //set file pointer to 0; I'm a little bit paranoid, you can remove this
 fseek($fh, 0, SEEK_SET);
 //set multiplicator to zero
 $count = 0;
 while (true) {
 //jump 1 MB forward in file
 fseek($fh, 1048576, SEEK_CUR);
 //check if we actually left the file
 if (($char = fgetc($fh)) !== false) {
 //if not, go on
 $count ++;
 } else {
 //else jump back where we were before leaving and exit loop
 fseek($fh, -1048576, SEEK_CUR);
 break;
 }
 }
 //we could make $count jumps, so the file is at least $count * 1.000001 MB large
 //1048577 because we jump 1 MB and fgetc goes 1 B forward too
 $size = bcmul("1048577", $count);
 //now count the last few bytes; they're always less than 1048576 so it's quite fast
 $fine = 0;
 while(false !== ($char = fgetc($fh))) {
 $fine ++;
 }
 //and add them
 $size = bcadd($size, $fine);
 fclose($fh);
 return $size;
}
?&gt;
</code></pre>

blocks|key|874537|text|您可以使用get_headers()函数获取文件大小。使用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|874538|++++$image+=+get_headers($url,+1);
++++$bytes+=+$image["Content-Length"];
++++$mb+=+$bytes/(1024+*+1024);
++++echo+number_format($mb,2)+.+"+MB";|code-block|syntax|javascript|874539|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can get the file size by using the get_headers() function. Use below code:

<pre><code> $image = get_headers($url, 1);
 $bytes = $image["Content-Length"];
 $mb = $bytes/(1024 * 1024);
 echo number_format($mb,2) . " MB";
</code></pre>

php how to get web image size in kb?

<code>getimagesize</code> only get the width and height.

and <code>filesize</code> caused <code>waring</code>.

<pre><code>$imgsize=filesize("http://static.adzerk.net/Advertisers/2564.jpg");
echo $imgsize;
</code></pre>

<code>Warning: filesize() [function.filesize]: stat failed for http://static.adzerk.net/Advertisers/2564.jpg</code>

Is there any other way to get a web image size in kb?

php how to get web image size in kb?

php如何获取网页图片大小，单位为kb？getimagesize只获取宽度和高度。waring是由filesize引起的。$imgsize=filesize("http://static.adzerk.net/Advertisers/2564.jpg");echo $imgsize;Warning: filesize() [function.filesize]: stat failed for h

问php如何获取网页图片大小，单位为kb？
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回答 7

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问php如何获取网页图片大小，单位为kb？EN

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问php如何获取网页图片大小，单位为kb？
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