在PHP中使用gzip解压缩大文件 [英] Unpack large files with gzip in PHP

问题描述

我为文件使用了一个简单的解压缩功能(如下所示)，因此在进一步处理文件之前，不必手动解压缩文件.

I'm using a simple unzip function (as seen below) for my files so I don't have to unzip files manually before they are processed further.

function uncompress($srcName, $dstName) {
    $string = implode("", gzfile($srcName));
    $fp = fopen($dstName, "w");
    fwrite($fp, $string, strlen($string));
    fclose($fp);
} 

问题是，如果gzip文件很大(例如50mb)，则解压缩将需要大量的ram处理.

The problem is that if the gzip file is large (e.g. 50mb) the unzipping takes a large amount of ram to process.

问题:我可以分块解析gzip压缩的文件，但仍然可以获得正确的结果吗?还是有更好的其他方法来处理提取大型gzip文件的问题(即使还要花几秒钟的时间)?

The question: can I parse a gzipped file in chunks and still get the correct result? Or is there a better other way to handle the issue of extracting large gzip files (even if it takes a few seconds more)?

推荐答案

gzfile()是调用gzopen，gzread和gzclose的便捷方法.

gzfile() is a convenience method that calls gzopen, gzread, and gzclose.

是的，您可以手动执行gzopen并gzread读取文件.

So, yes, you can manually do the gzopen and gzread the file in chunks.

这将以4kB的块解压缩文件:

This will uncompress the file in 4kB chunks:

function uncompress($srcName, $dstName) {
    $sfp = gzopen($srcName, "rb");
    $fp = fopen($dstName, "w");

    while (!gzeof($sfp)) {
        $string = gzread($sfp, 4096);
        fwrite($fp, $string, strlen($string));
    }
    gzclose($sfp);
    fclose($fp);
}

这篇关于在PHP中使用gzip解压缩大文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！