用另一个替换链接

I'm struggling on replacing text in each link.

$reg_ex = "/(http|https)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

$text = '<br /><p>this is a content with a link we are supposed to <a href="http://www.google.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.amazon.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.wow.com">click</a></p>';

if(preg_match_all($reg_ex, $text, $urls))
{

    foreach($urls[0] as $url)
    {

        echo $replace = str_replace($url,'http://www.sometext'.$url,  $text);
    }

}

From the code above, I'm getting 3x the same text, and the links are changed one by one: everytime is replaced only one link - because I use foreach, I know. But I don't know how to replace them all at once. Your help would be great!

You don't use regexes on html. use DOM instead. That being said, your bug is here:

$replace = str_replace(...., $text);
^^^^^^^^---                  ^^^^^---

you never update $text, so you continually trash the replacement on every iteration of the loop. You probably want

$text = str_replace(...., $text);

instead, so the changes "propagate"

If you want the final variable to contain all replacements change it so something like this... You basically are not passing the replaced string back into the "subject". I assume that is what you are expecting since it's a bit difficult to understand the question.

$reg_ex = "/(http|https)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

$text = '<br /><p>this is a content with a link we are supposed to <a href="http://www.google.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.amazon.com">click</a></p><p>another - this is a content with a link we are supposed to <a href="http://www.wow.com">click</a></p>';

if(preg_match_all($reg_ex, $text, $urls))
{
    $replace = $text;
    foreach($urls[0] as $url) {

        $replace = str_replace($url,'http://www.sometext'.$url,  $replace);
    }

    echo $replace;
}