Replace one URL with another

Question

In PHP, replace one URL with another within a string e.g.

New post on the site <a href="http://stackoverflow.com/xyz1"&gt;http://stackoverflow.com/xyz1&lt;/a&gt;&lt;/p&gt;

becomes:

New post on the site <a href="http://yahoo.com/abc1"&gt;http://yahoo.com/abc1&lt;/a&gt;&lt;/p&gt;

Must work for repeating strings as above. Appreciate this is simple but struggling!

Answer 1

Use str_replace():

$text = str_replace('http://stackoverflow.com/xyz1', 'http://yahoo.com/abc1', $text);

That will replace the first URL with the second URL in $text.

Answer 2

Try this:

preg_replace('#(https?://)(www\.)?stackoverflow.com\b#', '\1\2yahoo.com', $text);

If you want to change the path after the url, add another group and use preg_replace_callabck. More information in the PHP documentation.

Answer 3

Can you give a better example of what you're looking for? Would str_replace do what you want, or perhaps preg_replace?

Answer 4

function replace_url($text, $newurl) {
    $text = preg_replace('@(https?://([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)?)@', $newurl, $text);
    return $text;
}

Should work. Regex stolen from here. This will replace all URLs in the string with the new one.