blocks|key|3279451|text|来自the+documentation：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3279452|3279453|如果post数据的大小大于post_max_size，则$_POST和$_FILES超全局变量为空。这可以通过各种方式进行跟踪，例如，通过将$_GET变量传递给处理数据的脚本，即检查是否设置了$GET‘’processed‘。|blockquote|style|BOLD|3279454|3279455|3279456|因此，不幸的是，PHP看起来不会发送错误。由于它发送的是一个空的$_POST数组，这就是为什么你的脚本返回到空白表单-它不认为这是一个帖子。(一个相当糟糕的设计决策IMHO)|3279457|This+commenter还有一个有趣的想法。|3279458|3279459|似乎更优雅的方法是比较post_max_size和$_SERVER‘’CONTENT_LENGTH‘。请注意，后者不仅包括上传文件的大小加上帖子数据，还包括多部分序列。|3279460|3279461|entityMap|0|LINK|mutability|MUTABLE|url|http://ca2.php.net/manual/en/ini.core.php#ini.post-max-size|1|http://ca2.php.net/manual/en/ini.core.php#66801^0|2|H|0|0|0|S|L|0|0|0|0|0|E|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|D|3|-4|5|6|7|17|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|18|8|@$A|19|B|1A|H|I]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|1D|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]]|C|$]]|$1|P|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]|$1|Q|3|R|5|G|7|1J|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]|$1|T|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]|11|$5|W|X|Y|C|$Z|12]]]]

From <a href="http://ca2.php.net/manual/en/ini.core.php#ini.post-max-size" rel="noreferrer">the documentation</a> :

<blockquote>
 If the size of post data is greater
 than post_max_size, the $_POST and
 $_FILES superglobals are empty. This
 can be tracked in various ways, e.g.
 by passing the $_GET variable to the
 script processing the data, i.e. &lt;form
 action="edit.php?processed=1">, and
 then checking if $_GET['processed'] is
 set.
</blockquote>

So unfortunately, it doesn't look like PHP sends an error. And since it sends am empty $_POST array, that is why your script is going back to the blank form - it doesn't think it is a POST. (Quite a poor design decision IMHO)

<a href="http://ca2.php.net/manual/en/ini.core.php#66801" rel="noreferrer">This commenter</a> also has an interesting idea. 

<blockquote>
 It seems that a more elegant way is
 comparison between post_max_size and
 $_SERVER['CONTENT_LENGTH']. Please
 note that the latter includes not only
 size of uploaded file plus post data
 but also multipart sequences.
</blockquote>

blocks|key|321649|text|有一种方法可以捕获/处理超过最大post大小的文件，这是我的首选，因为它会告诉最终用户发生了什么以及谁出了错;)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321650|if+(empty($_FILES)+&&+empty($_POST)+&&
++++++++isset($_SERVER['REQUEST_METHOD'])+&&
++++++++strtolower($_SERVER['REQUEST_METHOD'])+==+'post')+{
++++//catch+file+overload+error...
++++$postMax+=+ini_get('post_max_size');+//grab+the+size+limits...
++++echo+"<p+style=\"color:+#F00;\">\nPlease+note+files+larger+than+{$postMax}+will+result+in+this+error! Please+be+advised+this+is+not+a+limitation+in+the+CMS,+This+is+a+limitation+of+the+hosting+server. For+various+reasons+they+limit+the+max+size+of+uploaded+files,+if+you+have+access+to+the+php+ini+file+you+can+fix+this+by+changing+the+post_max_size+setting. +If+you+can't+then+please+ask+your+host+to+increase+the+size+limits,+or+use+the+FTP+uploaded+form";+//+echo+out+error+and+solutions...
++++addForm();+//bounce+back+to+the+just+filled+out+form.
}
else+{
++++//+continue+on+with+processing+of+the+page...
}|code-block|syntax|javascript|321651|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|$]]

there is a way to catch / handle files exceeding max post size, this is my preferred on, as it tells the end user what has happened and who is at fault ;)

<pre><code>if (empty($_FILES) &amp;&amp; empty($_POST) &amp;&amp;
 isset($_SERVER['REQUEST_METHOD']) &amp;&amp;
 strtolower($_SERVER['REQUEST_METHOD']) == 'post') {
 //catch file overload error...
 $postMax = ini_get('post_max_size'); //grab the size limits...
 echo "&lt;p style=\"color: #F00;\"&gt;\nPlease note files larger than {$postMax} will result in this error!&lt;br&gt;Please be advised this is not a limitation in the CMS, This is a limitation of the hosting server.&lt;br&gt;For various reasons they limit the max size of uploaded files, if you have access to the php ini file you can fix this by changing the post_max_size setting.&lt;br&gt; If you can't then please ask your host to increase the size limits, or use the FTP uploaded form&lt;/p&gt;"; // echo out error and solutions...
 addForm(); //bounce back to the just filled out form.
}
else {
 // continue on with processing of the page...
}
</code></pre>

blocks|key|3279467|text|我们得到了SOAP请求的问题，其中检查$_POST和$_FILES的空性不起作用，因为它们在有效的请求中也是空的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3279468|因此，我们实现了一个检查，比较了CONTENT_LENGTH和post_max_size。抛出的异常稍后由我们注册的异常处理程序转换为XML-SOAP-FAULT。|3279469|private+function+checkPostSizeExceeded()+{
++++$maxPostSize+=+$this->iniGetBytes('post_max_size');

++++if+($_SERVER['CONTENT_LENGTH']+>+$maxPostSize)+{
++++++++throw+new+Exception(
++++++++++++sprintf('Max+post+size+exceeded!+Got+%25s+bytes,+but+limit+is+%25s+bytes.',
++++++++++++++++$_SERVER['CONTENT_LENGTH'],
++++++++++++++++$maxPostSize
++++++++++++)
++++++++);
++++}
}

private+function+iniGetBytes($val)
{
++++$val+=+trim(ini_get($val));
++++if+($val+!=+'')+{
++++++++$last+=+strtolower(
++++++++++++$val{strlen($val)+-+1}
++++++++);
++++}+else+{
++++++++$last+=+'';
++++}
++++switch+($last)+{
++++++++//+The+'G'+modifier+is+available+since+PHP+5.1.0
++++++++case+'g':
++++++++++++$val+*=+1024;
++++++++++++//+fall+through
++++++++case+'m':
++++++++++++$val+*=+1024;
++++++++++++//+fall+through
++++++++case+'k':
++++++++++++$val+*=+1024;
++++++++++++//+fall+through
++++}

++++return+$val;
}|code-block|syntax|javascript|3279470|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|$]]

We got the problem for SOAP requests where a check for emptiness of $_POST and $_FILES doesn't work, because they are also empty on valid requests.

Therefore we implemented a check, comparing CONTENT_LENGTH and post_max_size. The thrown Exception is later on transformed into a XML-SOAP-FAULT by our registered exception handler.

<pre><code>private function checkPostSizeExceeded() {
 $maxPostSize = $this-&gt;iniGetBytes('post_max_size');

 if ($_SERVER['CONTENT_LENGTH'] &gt; $maxPostSize) {
 throw new Exception(
 sprintf('Max post size exceeded! Got %s bytes, but limit is %s bytes.',
 $_SERVER['CONTENT_LENGTH'],
 $maxPostSize
 )
 );
 }
}

private function iniGetBytes($val)
{
 $val = trim(ini_get($val));
 if ($val != '') {
 $last = strtolower(
 $val{strlen($val) - 1}
 );
 } else {
 $last = '';
 }
 switch ($last) {
 // The 'G' modifier is available since PHP 5.1.0
 case 'g':
 $val *= 1024;
 // fall through
 case 'm':
 $val *= 1024;
 // fall through
 case 'k':
 $val *= 1024;
 // fall through
 }

 return $val;
}
</code></pre>

blocks|key|3279472|text|基于@Matt+McCormick和@AbdullahAJM的答案，下面是一个PHP测试用例，它检查测试中使用的变量是否已设置，然后检查$_SERVER‘’CONTENT_LENGTH‘是否超过php_max_filesize设置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3279473|++++++++++++if+(
++++++++++++++++isset(+$_SERVER['REQUEST_METHOD']+)++++++&&
++++++++++++++++($_SERVER['REQUEST_METHOD']+===+'POST'+)+&&
++++++++++++++++isset(+$_SERVER['CONTENT_LENGTH']+)++++++&&
++++++++++++++++(+empty(+$_POST+)+)
++++++++++++)+{
++++++++++++++++$max_post_size+=+ini_get('post_max_size');
++++++++++++++++$content_length+=+$_SERVER['CONTENT_LENGTH']+/+1024+/+1024;
++++++++++++++++if+($content_length+>+$max_post_size+)+{
++++++++++++++++++++print+"<div+class='updated+fade'>"+.
++++++++++++++++++++++++sprintf(
++++++++++++++++++++++++++++__('It+appears+you+tried+to+upload+%25d+MiB+of+data+but+the+PHP+post_max_size+is+%25d+MiB.',+'csa-slplus'),
++++++++++++++++++++++++++++$content_length,
++++++++++++++++++++++++++++$max_post_size
++++++++++++++++++++++++)+.
++++++++++++++++++++++++' '+.
++++++++++++++++++++++++__(+'Try+increasing+the+post_max_size+setting+in+your+php.ini+file.'+,+'csa-slplus'+)+.
++++++++++++++++++++++++'</div>';
++++++++++++++++}
++++++++++++}|code-block|syntax|javascript|3279474|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|$]]

Building on @Matt McCormick's and @AbdullahAJM's answers, here is a PHP test case that checks the variables used in the test are set and then checks if the $_SERVER['CONTENT_LENGTH'] exceeds the php_max_filesize setting:

<pre><code> if (
 isset( $_SERVER['REQUEST_METHOD'] ) &amp;&amp;
 ($_SERVER['REQUEST_METHOD'] === 'POST' ) &amp;&amp;
 isset( $_SERVER['CONTENT_LENGTH'] ) &amp;&amp;
 ( empty( $_POST ) )
 ) {
 $max_post_size = ini_get('post_max_size');
 $content_length = $_SERVER['CONTENT_LENGTH'] / 1024 / 1024;
 if ($content_length &gt; $max_post_size ) {
 print "&lt;div class='updated fade'&gt;" .
 sprintf(
 __('It appears you tried to upload %d MiB of data but the PHP post_max_size is %d MiB.', 'csa-slplus'),
 $content_length,
 $max_post_size
 ) .
 '&lt;br/&gt;' .
 __( 'Try increasing the post_max_size setting in your php.ini file.' , 'csa-slplus' ) .
 '&lt;/div&gt;';
 }
 }
</code></pre>

blocks|key|318708|text|这是解决此问题的一种简单方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|318709|只需在代码开始处调用"checkPostSizeExceeded“|318710|function+checkPostSizeExceeded()+{
++++++++if+(isset($_SERVER['REQUEST_METHOD'])+and+$_SERVER['REQUEST_METHOD']+==+'POST'+and
++++++++++++isset($_SERVER['CONTENT_LENGTH'])+and+empty($_POST)//if+is+a+post+request+and+$_POST+variable+is+empty(a+symptom+of+"post+max+size+error")
++++++++)+{
++++++++++++$max+=+get_ini_bytes('post_max_size');//get+the+limit+of+post+size+
++++++++++++$send+=+$_SERVER['CONTENT_LENGTH'];//get+the+sent+post+size

++++++++++++if($max+<+$_SERVER['CONTENT_LENGTH'])//compare
++++++++++++++++throw+new+Exception(
++++++++++++++++++++'Max+size+exceeded!+Were+sent+'+.+
++++++++++++++++++++++++number_format($send/(1024*1024),+2)+.+'MB,+but+'+.+number_format($max/(1024*1024),+2)+.+'MB+is+the+application+limit.'
++++++++++++++++++++);
++++++++}
++++}|code-block|syntax|javascript|318711|记住复制这个辅助函数：|318712|function+get_ini_bytes($attr){
++++$attr_value+=+trim(ini_get($attr));

++++if+($attr_value+!=+'')+{
++++++++$type_byte+=+strtolower(
++++++++++++$attr_value{strlen($attr_value)+-+1}
++++++++);
++++}+else
++++++++return+$attr_value;

++++switch+($type_byte)+{
++++++++case+'g':+$attr_value+*=+1024*1024*1024;+break;
++++++++case+'m':+$attr_value+*=+1024*1024;+break;
++++++++case+'k':+$attr_value+*=+1024;+break;
++++}

++++return+$attr_value;
}|318713|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

That is a simple way to fix this problem:

Just call "checkPostSizeExceeded" on begin of your code

<pre><code>function checkPostSizeExceeded() {
 if (isset($_SERVER['REQUEST_METHOD']) and $_SERVER['REQUEST_METHOD'] == 'POST' and
 isset($_SERVER['CONTENT_LENGTH']) and empty($_POST)//if is a post request and $_POST variable is empty(a symptom of "post max size error")
 ) {
 $max = get_ini_bytes('post_max_size');//get the limit of post size 
 $send = $_SERVER['CONTENT_LENGTH'];//get the sent post size

 if($max &lt; $_SERVER['CONTENT_LENGTH'])//compare
 throw new Exception(
 'Max size exceeded! Were sent ' . 
 number_format($send/(1024*1024), 2) . 'MB, but ' . number_format($max/(1024*1024), 2) . 'MB is the application limit.'
 );
 }
 }
</code></pre>

Remember copy this auxiliar function:

<pre><code>function get_ini_bytes($attr){
 $attr_value = trim(ini_get($attr));

 if ($attr_value != '') {
 $type_byte = strtolower(
 $attr_value{strlen($attr_value) - 1}
 );
 } else
 return $attr_value;

 switch ($type_byte) {
 case 'g': $attr_value *= 1024*1024*1024; break;
 case 'm': $attr_value *= 1024*1024; break;
 case 'k': $attr_value *= 1024; break;
 }

 return $attr_value;
}
</code></pre>

I'm working on a PHP form that attaches a file to an email, and trying to gracefully handle cases where the uploaded file is too large.

I've learned that there are two settings in <code>php.ini</code> that affect the maxiumum size of a file upload: <code>upload_max_filesize</code> and <code>post_max_size</code>. 

If a file's size exceeds <code>upload_max_filesize</code>, PHP returns the file's size as 0. That's fine; I can check for that.

But if it exceeds <code>post_max_size</code>, my script fails silently and goes back to the blank form.

Is there any way to catch this error?

How to gracefully handle files that exceed PHP's `post_max_size`?

我正在处理一个PHP表单，该表单将一个文件附加到电子邮件中，并尝试优雅地处理上传的文件太大的情况。我了解到php.ini中有两个设置会影响文件上传的最大大小：upload_max_filesize和post_max_size。如果一个文件的大小超过了upload_max_filesize，PHP会返回该文件的大小为0。...

问如何优雅地处理超出PHP `post_max_size`的文件？
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