正则表达式修复此问题？ [延期]

Question

Sorry for the redundancy, I should've asked this in my previous question here: What's the regex to solve this problem?

This question is an extension:

From the elements in an array below:

http://example.com/apps/1235554/
http://example.com/apps/apple/
http://example.com/apps/126734
http://example.com/images/a.jpg

I'm separating out apps/{number}/ and apps/{number} using:

foreach ($urls as $url)
{
    if (preg_match('~apps/[0-9]+(/|$)~', $url)) echo $url;
}

Now, how do I also push {number} to another array with the same regex?

Answer 1

preg_match() takes an array as third parameter that will contain the matches. Create a capture group with () and the number will then be contained in $matches[1]:

$numbers = array();

foreach ($urls as $url)
{
    $matches = array();
    if (preg_match('~apps/([0-9]+)~', $url, $matches)) { // note the "( )" in the regex
        echo $url;
        $numbers[] = $matches[1];
    }
}

FYI, $matches[0] contains the whole matched pattern as described in the documentation. Of course you can name the array as you like.