如何在PHP中从X行到Y行打开文件? [英] How do I open a file from line X to line Y in PHP?

问题描述

我在PHP文档中看到的最接近的是fread()给定的长度，但这并没有指定从哪一行开始.还有其他建议吗?

The closest I've seen in the PHP docs, is to fread() a given length, but that doesnt specify which line to start from. Any other suggestions?

推荐答案

您将无法从X行开始读取，因为行可以是任意长度.因此，您必须从头开始阅读，以计数读取的行数才能到达X行.例如:

You not going to be able to read starting from line X because lines can be of arbitrary length. So you will have to read from the start counting the number of lines read to get to line X. For example:

<?php
$f = fopen('sample.txt', 'r');
$lineNo = 0;
$startLine = 3;
$endLine = 6;
while ($line = fgets($f)) {
    $lineNo++;
    if ($lineNo >= $startLine) {
        echo $line;
    }
    if ($lineNo == $endLine) {
        break;
    }
}
fclose($f);

这篇关于如何在PHP中从X行到Y行打开文件?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！