usort():数组已由用户比较功能修改 [英] usort(): Array was modified by the user comparison function

问题描述

我有一个Web应用程序，可以在我们的Linux服务器上正常运行，但是在使用PHP 5.3的Zend Community Edition Server在Mac OS上运行时，出现错误:

I have a web application that runs fine on our Linux servers but when running on Mac OS with the Zend Community Edition Server using PHP 5.3 we get the error:

usort():数组已通过用户比较功能修改

usort(): Array was modified by the user comparison function

页面第一次加载时(页面在Linux服务器上翻页并加载大约需要2分钟，页面加载时间为1秒).

every time a page loads for the first time (it takes about 2 minutes for a page to tick over and load, on the linux servers the page loads in 1 second).

让其他任何人都经历过此事或对如何解决该问题有任何想法，我曾尝试过PHP和Apache内存设置，但是没有运气.

Has anyone else experienced this or has any idea how I can fix the problem, I have tried playing around with PHP and Apache memory settings with no luck.

推荐答案

即使您不更改数组，也存在可能导致此警告的PHP错误.

There is a PHP bug that can cause this warning, even if you don't change the array.

简短版本，如果有任何PHP调试函数检查sort数组，它们将更改引用计数并欺骗usort()认为您已更改数据.

Short version, if any PHP debug functions examine the sort array, they will change the reference count and trick usort() into thinking you've changed the data.

因此，您可以通过在sort函数(或从中调用的任何代码)中执行以下任何操作来获得该警告:

So you will get that warning by doing any of the following in your sort function (or any code called from it):

• 在任何排序数据上调用var_dump或print_r
• 致电debug_backtrace()
• 引发异常-任何异常-甚至只是创建一个异常

• calling var_dump or print_r on any of the sort data
• calling debug_backtrace()
• throwing an exception -- any exception -- or even just creating an exception

该错误影响所有PHP 5版本> = 5.2.11，但不影响PHP> =7.请参阅

The bug affects all PHP 5 versions >= 5.2.11 but does not affect PHP >= 7. See the bug report for further details.

据我所知，唯一的解决方法是不要那样做"(对于异常情况有点难)，或者使用错误抑制运算符@usort()来忽略所有错误.

As far as I can see, the only workaround is either "don't do that" (which is kind of hard for exceptions), or use the error suppression operator @usort() to ignore all errors.

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