清除字符串以放置在URL中的最佳方法是什么，例如SO上的问题名称? [英] What is the best way to clean a string for placement in a URL, like the question name on SO?

问题描述

我正在寻找一个URL字符串，就像一个SO用来链接问题的URL一样.我不打算重写URL(mod_rewrite).我正在寻找在页面上生成链接.

I'm looking to create a URL string like the one SO uses for the links to the questions. I am not looking at rewriting the url (mod_rewrite). I am looking at generating the link on the page.

示例:问题名称为:

Is it better to use ob_get_contents() or $text .= ‘test’;

URL最终为:

http://stackoverflow.com/questions/292068/is-it-better-to-use-obgetcontents-or-text-test

我感兴趣的部分是:

is-it-better-to-use-obgetcontents-or-text-test

因此，基本上，我希望在保持URL可读性的同时清除所有不是字母数字的内容.我创建了以下内容，但是我不确定这是最好的方法还是它涵盖了所有可能性:

So basically I'm looking to clean out anything that is not alphanumeric while still keeping the URL readable. I have the following created, but I'm not sure if it's the best way or if it covers all the possibilities:

$str = urlencode(
    strtolower(
    str_replace('--', '-', 
    preg_replace(array('/[^a-z0-9 ]/i', '/[^a-z0-9]/i'), array('', '-'), 
    trim($urlPart)))));

所以基本上:

1. 修剪
2. 替换任何非字母数字加空格的内容
3. 然后用破折号替换所有非字母数字的
4. 用-替换.
5. strtolower()
6. urlencode()-可能不需要，但只是出于很好的考虑.

1. trim
2. replace any non alphanumeric plus the space with nothing
3. then replace everything not alphanumeric with a dash
4. replace -- with -.
5. strtolower()
6. urlencode() -- probably not needed, but just for good measure.

推荐答案

您已经指出，在这种情况下不需要urlencode()，而且trim()也不需要.如果我理解正确，则第4步是避免连续出现多个破折号，但它不会阻止两个以上的破折号.另一方面，连接两个单词的短划线(例如大范围")将被您的解决方案删除，而它们似乎保留在SO上.

As you pointed out already, urlencode() is not needed in this case and neither is trim(). If I understand correctly, step 4 is to avoid multiple dashes in a row, but it will not prevent more than two dashes. On the other hand, dashes connecting two words (like in "large-scale") will be removed by your solution while they seem to be preserved on SO.

我不确定这是否真的是最好的方法，但这是我的建议:

I'm not sure that this is really the best way to do it, but here's my suggestion:

$str = strtolower( 
  preg_replace( array('/[^a-z0-9\- ]/i', '/[ \-]+/'), array('', '-'), 
  $urlPart ) );

所以:

1. 删除任何既不是空格，破折号也不是字母数字的字符
2. 用单个破折号替换任何连续数量的空格或破折号
3. strtolower()

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