额外的空间会减慢处理器的速度吗? [英] Does extra space slow down the processor?

问题描述

了解如何正确"取消设置节点后，我注意到使用 PHP 的 unset() 函数会留下制表符和空格.所以现在我有时在节点之间有一大块空白.我想知道 PHP 是否会遍历空格/返回/制表符，以及它是否最终会减慢系统速度.

After learning how to "correctly" unset a node, I noticed that using PHP's unset() function leaves the tabs and spaces behind. So now I have this big chunk of white space in between nodes at times. I'm wondering if PHP iterates through blank spaces/returns/tabs and whether it would eventually slow down the system.

我也想问有没有容易去除未设置留下的空间?

I'm also asking whether there's an easy to remove the space unset leaves behind?

谢谢，瑞恩

补充说明:

这就是我在取消设置节点后删除空格的方法，它对我有用.

This is how I removed the whitespaces after unsetting a node and it worked for me.

$dom = new DOMDocument();
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->load($xmlPath);
$dom->save($xmlPath);

推荐答案

它是否会减慢进程:可能很少关心.

Wether it slows down the process: probably to little to care about.

simpleXML 就是这么简单.如果你需要一个漂亮"的输出，DOM 是你的朋友:

And simpleXML is just that, simple. If you require a 'pretty' output, DOM is your friend:

<?php
$xml = '
<xml>
        <node>foo </node>
        <other>bar</other>
</xml>';
$x = new SimpleXMLElement($xml);
unset($x->other);
echo $x->asXML();

$dom = new DOMDocument();
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->loadXML($xml);
$dom->documentElement->removeChild($dom->documentElement->lastChild);
echo $dom->saveXML();

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