[RESOLVED] Regexp URL querystring

[nocando]

My URL looks like this:
http://www.mysite.com/index.php?id=189
...or...
http://www.mysite.com/index.php?id=189&anotherid=234jhk234
And I want to get the value of 'id' into a variable. I've tried something like this but can't seem to get it right:

$pattern = "id=\d+\";
preg_match_all($pattern,$data,$match)

How do I do it? 😕

[bpat1434]

$GET['id'] or $GET['anotherid'].....

As for your regexp, it's missing a few things. It needs a starting and terminating character (usually "/"). It also needs parentheses to define sections to grab. So it probably should look like:

<?php

// The query string...
$qstring = $_SERVER['QUERY_STRING'];

// The pattern to match
$pattern = '/id=([0-9]*?)/i';

// Run the pattern against the string
preg_match_all($pattern, $qstring, $matches);

// Dump our results
var_dump($matches);

?>

[bradgrafelman]

As bpat suggested, is there a reason you're not using the $_GET superglobal?

[bogu]

If u want to parse url look at this function: [man]parse_url[/man]

[nocando]

Thanks everyone! 🙂
I can't use $_GET because i collect the url from a form as a string. And i have no real use for parse_url since there can be several querys in my url, and i only want the value of 'id'.

I've tried this code:

$pattern = '/tavling=([0-9]*?)/i';
preg_match_all($pattern, $_POST[url], $matches);
foreach($matches[1] as $key => $val) {
	echo "'".$val."'";
}

But it doesn't find anything, or more correct, it looks as if it finds something but the results i get looks like this: ''
Why is that?

[bpat1434]

If you only want the value of "id", and you know it's there, it's easiest to use $_GET['id'].

[nocando]

Ok, but how do i do that when i only have the url as a post-variable from a form?

[bpat1434]

If the form method is post (<form method="post">):
Use the $_POST global array.

If the form method is get (<form method="get">):
Use the $_GET global array.

If the variables & values are in the URL, use the $_GET global array.

[Installer]

Here's a more generic way to do it:

function get_query_value($url, $name, $separator = '&')
{
    $url_arr = parse_url($url);
    if (isset($url_arr['query'])) {
        $qry_arr = explode($separator, $url_arr['query']);
        foreach ($qry_arr as $each) {
            if (substr($each, 0, strlen($name)) == $name) {
                return ltrim(strrchr($each, '='), '=');
            }
        }
    }
    return false;
}

[bpat1434]

But why go through all of that when you can just use the $POST and $GET arrays appropriately?

[NogDog]

<?php
$test = "http://www.domain.com/page.php?id=123&other=foobar#anchor";
parse_str(parse_url($test, PHP_URL_QUERY), $urlVars);
if(isset($urlVars['id']))
{
   echo "ID = {$urlVars['id']}";
}

?>

[bradgrafelman]

bpat - I believe what he's saying is that he's submitting the URL as a string via a form... not the actual URL of the page...

[nocando]

bradgrafelman is right.
i believe i posted an answer earlier today but obviously i didn't. Installer's code did the job, but maybe NogDogs code is even better. I'll try it tomorrow. Thanks everyone! Problem solved! 🙂