blocks|key|709275|text|你可以通过使用这个函数得到进程已经消耗的内存大小，memory_get_peak_usage文档在http://www.php.net/manual/en/function.memory-get-peak-usage.php上，我认为如果你可以在进程几乎达到内存限制之前添加一个条件来重定向或停止进程，这将会更容易。:)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|709276|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/function.memory-get-peak-usage.php^0|1D|1R|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]]]]

<p>you could get the size of the memory already consumed by the process by using this function memory_get_peak_usage documentations are at <a href="http://www.php.net/manual/en/function.memory-get-peak-usage.php" rel="noreferrer">http://www.php.net/manual/en/function.memory-get-peak-usage.php</a> I think it would be easier if you could add a condition to redirect or stop the process before the memory limit is almost reached by the process. :)</p>


blocks|key|709353|text|如果在发生此错误时需要执行业务代码(日志记录、为将来的调试备份上下文、发送电子邮件等)，注册一个关闭函数是不够的:您应该以某种方式释放内存。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|709354|一种解决方案是在某个地方分配一些紧急内存：|709355|public+function+initErrorHandler()
{
++++//+This+storage+is+freed+on+error+(case+of+allowed+memory+exhausted)
++++$this->memory+=+str_repeat('*',+1024+*+1024);

++++register_shutdown_function(function()
++++{
++++++++$this->memory+=+null;
++++++++if+((!is_null($err+=+error_get_last()))+&&+(!in_array($err['type'],+array+(E_NOTICE,+E_WARNING))))
++++++++{
+++++++++++//+$this->emergencyMethod($err);
++++++++}
++++});
++++return+$this;
}|code-block|syntax|javascript|709356|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|$]]

<p>If you need to execute business code when this error happens (logging, backup of the context for future debugs, emailing or such), registering a shutdown function is not enough: you should free memory in a way.</p>

<p>One solution is to allocate some emergency memory somewhere:</p>

<pre><code>public function initErrorHandler()
{
    // This storage is freed on error (case of allowed memory exhausted)
    $this-&gt;memory = str_repeat('*', 1024 * 1024);

    register_shutdown_function(function()
    {
        $this-&gt;memory = null;
        if ((!is_null($err = error_get_last())) &amp;&amp; (!in_array($err['type'], array (E_NOTICE, E_WARNING))))
        {
           // $this-&gt;emergencyMethod($err);
        }
    });
    return $this;
}
</code></pre>


blocks|key|493644|text|虽然@alain-tiemblo解决方案运行良好，但我把这个脚本放在php脚本中展示了如何在对象作用域之外保留一些内存。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|493645|简短版本|493646|//+memory+is+an+object+and+it+is+passed+by+reference
function+shutdown($memory)+{
++++//+unsetting+$memory+does+not+free+up+memory
++++//+I+also+tried+unsetting+a+global+variable+which+did+not+free+up+the+memory
++++unset($memory->reserve);
}

$memory+=+new+stdClass();
//+reserve+3+mega+bytes
$memory->reserve+=+str_repeat('❤',+1024+*+1024);

register_shutdown_function('shutdown',+$memory);|code-block|syntax|javascript|493647|完整的示例脚本|493648|<?php

function+getMemory(){
++++return+((int)+(memory_get_usage()+/+1024))+.+'KB';
}

//+memory+is+an+object+and+it+is+passed+by+reference
function+shutdown($memory)+{
++++echo+'Start+Shut+Down:+'+.+getMemory()+.+PHP_EOL;

++++//+unsetting+$memory+does+not+free+up+memory
++++//+I+also+tried+unsetting+a+global+variable+which+did+not+free+up+the+memory
++++unset($memory->reserve);

++++echo+'End+Shut+Down:+'+.+getMemory()+.+PHP_EOL;
}

echo+'Start:+'+.+getMemory()+.+PHP_EOL;

$memory+=+new+stdClass();
//+reserve+3+mega+bytes
$memory->reserve+=+str_repeat('❤',+1024+*+1024);

echo+'After+Reserving:+'+.+getMemory()+.+PHP_EOL;

unset($memory);

echo+'After+Unsetting:+'+.+getMemory()+.+PHP_EOL;

$memory+=+new+stdClass();
//+reserve+3+mega+bytes
$memory->reserve+=+str_repeat('❤',+1024+*+1024);

echo+'After+Reserving+again:+'+.+getMemory()+.+PHP_EOL;

//+passing+$memory+object+to+shut+down+function
register_shutdown_function('shutdown',+$memory);|493649|输出结果为：|493650|Start:+349KB
After+Reserving:+3426KB
After+Unsetting:+349KB
After+Reserving+again:+3426KB
Start+Shut+Down:+3420KB
End+Shut+Down:+344KB|493651|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<p>While @alain-tiemblo solution works perfectly, I put this script to show how you can reserve some memory in a php script, out of object scope.</p>

<h3>Short Version</h3>

<pre><code>// memory is an object and it is passed by reference
function shutdown($memory) {
    // unsetting $memory does not free up memory
    // I also tried unsetting a global variable which did not free up the memory
    unset($memory-&gt;reserve);
}

$memory = new stdClass();
// reserve 3 mega bytes
$memory-&gt;reserve = str_repeat('❤', 1024 * 1024);

register_shutdown_function('shutdown', $memory);
</code></pre>

<h3>Full Sample Script</h3>

<pre><code>&lt;?php

function getMemory(){
    return ((int) (memory_get_usage() / 1024)) . 'KB';
}

// memory is an object and it is passed by reference
function shutdown($memory) {
    echo 'Start Shut Down: ' . getMemory() . PHP_EOL;

    // unsetting $memory does not free up memory
    // I also tried unsetting a global variable which did not free up the memory
    unset($memory-&gt;reserve);

    echo 'End Shut Down: ' . getMemory() . PHP_EOL;
}

echo 'Start: ' . getMemory() . PHP_EOL;

$memory = new stdClass();
// reserve 3 mega bytes
$memory-&gt;reserve = str_repeat('❤', 1024 * 1024);

echo 'After Reserving: ' . getMemory() . PHP_EOL;

unset($memory);

echo 'After Unsetting: ' . getMemory() . PHP_EOL;

$memory = new stdClass();
// reserve 3 mega bytes
$memory-&gt;reserve = str_repeat('❤', 1024 * 1024);

echo 'After Reserving again: ' . getMemory() . PHP_EOL;

// passing $memory object to shut down function
register_shutdown_function('shutdown', $memory);
</code></pre>

<p>And the output would be:</p>

<pre><code>Start: 349KB
After Reserving: 3426KB
After Unsetting: 349KB
After Reserving again: 3426KB
Start Shut Down: 3420KB
End Shut Down: 344KB
</code></pre>


<p>I have a gateway script that returns JSON back to the client.
In the script I use <a href="http://php.net/manual/en/function.set-error-handler.php" rel="noreferrer">set_error_handler</a> to catch errors and still have a formatted return.</p>

<p>It is subject to 'Allowed memory size exhausted' errors, but rather than increase the memory limit with something like <a href="http://php.net/manual/en/function.ini-set.php" rel="noreferrer">ini_set('memory_limit', '19T')</a>, I just want to return that the user should try something else because it used to much memory.</p>

<p>Are there any good ways to catch fatal errors?</p>


Safely catch a 'Allowed memory size exhausted' error in PHP

JSON

我有一个网关脚本，它将JSON返回给客户机。在脚本中，我使用来捕获错误，但仍然有一个格式化的返回。它会受到“允许的内存大小耗尽”错误的影响，而不是像这样的东西来增加内存限制，我只想返回用户应该尝试其他东西，因为它使用了很多内存。有没有什么好方法来捕捉致命的错误？

问在PHP中安全地捕获“允许的内存大小耗尽”错误
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