使用php从URL字符串中捕获值

I need to extract a variable's value from a string, which happens to be a URL. The string/url is loaded as part of a separate php query, not the url in the browser.

The url's will look like:

index.php?option=com_content&view=article&catid=334:golfeq&id=2773:xcelsiors&Itemid=44

How can I always find & capture the value of the id which in this example is 2773?

I read several examples already, but what I've tried captures the id value of the current page which is being viewed in the browser, and not the URL string.

Thanks

You are looking for a combination or parse_url (which will isolate the query string for you) and parse_str (which will parse the variables and put them into an array).

For example:

$url = 'index.php?option=com_content&view=article&catid=334:golfeq&id=2773:xcelsiors&Itemid=44';

// This parses the url for the query string, and parses the vars from that
// into the array $vars (which is created on the spot).
parse_str(parse_url($url, PHP_URL_QUERY), $vars);

print_r($vars); // see what's in there

// Parse the value "2773:xcelsiors" to isolate the number
$id = reset(explode(':', $vars['id']));

// This will also work:
$id = intval($vars['id']);

echo "The id is $id
";

See it in action.

You can use parse_str

You can use parse_url to parse URLs!

But you can use, to extract directly the numbers of ID variable:

$url = 'index.php?option=com_content&view=article&catid=334:golfeq&id=2773:xcelsiors&Itemid=44';
$id = preg_replace("/^.*[&?]id=([0-9]+).*$/",'$1',$url);
echo $id;