php Replace
Asked Jan 12 '15 at 20:22

Active Jan 12 '15 at 20:31

Viewed 377 times

Question

I'm stuck as preg_matching is not always that easy as I'm totally not familiar with it.

I'm trying to replace all the

In example:

<a href="www.site1.com">Site1</a> => <a href="http://example.com?u=www.site1.com">Site1</a>

But the <a href can be written in many ways; a HREF or A href or double spaced <A href etc... How can i manage this. Bear in mind, performance is key

I've tried the following with str_replace, but of course that does not cover all the <a href (capital non capitalized versions).

$str = '<a href="www.sitename1.com">sitename1</a><br /><a href="www.sitename2.com">sitename2</a><br /><A HREF="www.sitename3.com">sitename3</a>';

$Replace = str_replace('<a href="', '<a href="https://example.com/&i=1243123&r=', $str);

echo $Replace

You've tried a str_replace, how has your attempts with regular expressions gone? — Daryl Gill, Jan 12 '15 at 20:24

score 2 · Accepted Answer · answered Jan 12 '15 at 20:31

2

Try this (PHP 5.3+):

$link = preg_replace_callback('#<a(.*?)href="(.*?)"(.*?)>#is', function ($match) {
    return sprintf(
        '<a%shref="%s"%s>',
        $match[1],
        'http://example.com?u=' . urlencode($match[2]),
        $match[3]
    );
}, '<a href="www.site1.com">Site1</a>');

echo $link;

answered Jan 12 '15 at 20:31

Waldson Patricio

1,489
13
17

Looks like this one works. Anybody that has comments to this? Why not use this instead of the dom parse if performance en speed are key? – Peter Fox Jan 12 '15 at 20:34
1

You have to try them both and see which is faster. But I think this way is faster because this will not parse html and generate a traversable structure. Besides that, you will not iterate over the DOM neither manipulate it and regenerate modified HTML from structure. – Waldson Patricio Jan 12 '15 at 20:39

score 1 · Answer 2 · answered Jan 12 '15 at 20:28

The only fully reliable way of doing this is to use a proper HTML parser.

Happily, PHP has one built-in.

You'd first load the HTML with DomDocument's loadHTML function: http://php.net/manual/en/domdocument.loadhtml.php

Then search the parsed tree with XPath and manipulate the A tags: http://php.net/manual/en/domxpath.query.php

php Replace Asked Jan 12 '15 at 20:22 Active Jan 12 '15 at 20:31 Viewed 377 times

2 Answers2

php Replace
Asked Jan 12 '15 at 20:22

Active Jan 12 '15 at 20:31

Viewed 377 times