XMLReader 无法打开大型 (>2gb) XML 文件 [英] XMLReader can't open large (>2gb) XML files

问题描述

我编写了一个应用程序，它使用 XMLReader 在 PHP 中解析大型 XML 文件.

I've written an application that parses large XML files in PHP using XMLReader.

通常，当我尝试读取大于 2gb 的文件时，应用程序运行良好，EXCEPT.

Generally, the application works great, EXCEPT when I attempt to read a file that's larger than 2gb.

(我还没有弄清楚截止点的确切位置；它在 500mb 的文件上完美运行，但在我拥有的下一个最大文件 - 2.5gb 上失败了).

(I haven't figured out exactly where the cut-off is; it works flawlessly on a 500mb file, but fails on the next largest file I have - 2.5gb).

具体来说，如果我的代码如下所示:

Specifically, if my code looks like this:

$reader = new XMLReader();
if ($reader->open("big.xml")) {
    echo "Success!";
    $reader->close();
} else {
    echo "Failed!";
}

如果我测试大 (>2gb) 文件 - 我得到这个:

If I test the large (>2gb) file - I get this:

Warning: XMLReader::open() [xmlreader.open]: Unable to open source data in [php script]

当然，Failed! 是输出.

如果我尝试使用较小的 (500mb) 文件 - 我只会得到 Success! 输出.

If I try with a smaller (500mb) file - I get only the Succcess! output.

据我所知 - 无法打开的大文件和可以打开的中型文件之间没有区别(例如权限、有效的 XML、编码)EXCEPT 文件的大小.

As far as I can tell - there's no difference between the large files that can't be opened and the medium-size files that can be opened (e.g. permissions, valid XML, encoding) EXCEPT the size of the file.

虽然文件很大 - 节点都很小，所以我认为任何单个节点都不会导致内存问题.

While the size of the file is large - the nodes are all tiny, so I don't think any single node would cause a memory issue.

推荐答案

PHP 可能内存不足.试试:

PHP may be running out of memory. Try:

ini_set('memory_limit','256M');

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