php trim()，效果不佳 [英] php trim(), work poorly

问题描述

我需要从页面 url www 中剪切.使用 php trim() 函数.但是这个函数截了首字母，为什么呢?

I need cut from page url www. using php trim() function. But this function cut and first letter, why?

$domain = parse_url('http://wordpresas.com/page/1');
$domain['host'] = trim($domain['host'], 'www.');
pr($domain['host']); //ordpresas.com

推荐答案

正如其他人所说，trim() 的第二个参数包含 被修剪的字符列表.

As other have stated the second parameter of trim() contains a list of characters which get trimmed.

但是你可以使用 preg_replace() 为此.这将确保只有 www. 将被剥离，如果字符串以它开头.

However you can use preg_replace() for this. This will make sure only www. will be stripped if the string starts with it.

preg_replace('/^www./', '', $domain['host']);

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