Regex to get value of a numeric URL parameter?

Question

In a url like the one below, I'd like to get the value of ProdId. The URL format will always be consistent, as will the parameter name, but the length of the value may change. It will always be numeric.

http://www.example.com/page.php?ProdId=2683322&xpage=2

Using PHP what's the fastest way to get it (I'll be processing 10,000's so speed is an issue)?

Do you have strictly controlled input data or is there a chance someone will feed you something malformed? — Anonymoose
– Anonymoose, Commented May 30, 2010 at 22:02
It should always be the same but I'm assuming something malformed will show up at some point. — stef
– stef, Commented May 30, 2010 at 22:19

Mike B · Accepted Answer · 2010-05-30 22:26:02Z

13

PHP has built-in functions for this. Use parse_url() and parse_str() together.

Pieced together from php.net:

$url = 'http://www.example.com/page.php?ProdId=2683322&xpage=2';

// Parse the url into an array
$url_parts = parse_url($url);

// Parse the query portion of the url into an assoc. array
parse_str($url_parts['query'], $path_parts);

echo $path_parts['ProdId']; // 2683322
echo $path_parts['xpage']; // 2

edited May 30, 2010 at 22:26

answered May 30, 2010 at 22:15

Mike B

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2 Comments

Michael Mrozek Over a year ago

Wow, that's fantastic -- I never knew those existed

Matt K Over a year ago

Awesome, I also did not know these existed. Spent forever trying to work out the proper regex, I'm a noob I know... but I switched to these and done in less than a minute!

Gumbo · Accepted Answer · 2010-05-30 22:01:47Z

6

Try this regular expression:

^http://www\.example\.com/page\.php\?ProdId=(\d+)

answered May 30, 2010 at 22:01

Gumbo

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Comments

bluish · Accepted Answer · 2012-01-27 08:24:33Z

2

Can't you use $_GET['ProdId']?

edited Jan 27, 2012 at 8:24

bluish

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answered May 30, 2010 at 22:01

Funky Dude

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2 Comments

Michael Mrozek Over a year ago

Well, if he's analyzing the URL of the page he's currently on, yes, but if he'll "be processing 10,000's" he's probably not doing that

stef Over a year ago

Exactly: imagine a DB table with 10,000 URLs that go through my script, I can't use $_GET for that.

The Mask · Accepted Answer · 2013-06-08 04:43:00Z

2

Try this function:

/https?:\/{2}(?:w{3}\.)?[-.\w][^\.]+\.{2,}\/ProdId=\d+\&xpage=\d+/

edited Jun 8, 2013 at 4:43

The Mask

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answered May 31, 2010 at 16:04

Jet

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Comments

Matti Virkkunen · Accepted Answer · 2010-05-30 22:14:42Z

0

/^[^#?]*\?(?:[^#]*&)?ProdId=(\d+)(?:[#&]|$)/

And the same in English:

Match anything except ? or # (this will get us to the beginning of the query string or the hash part, whichever comes first)
Match the ? (if there was only a hash part, this will disqualify the match)
Optionally match anything (but not a #, in case there's a hash part) followed by &
Match your key value pair putting the value in a capturing subpattern
Match either the next param's &, the # or the end of the string.

edited May 30, 2010 at 22:14

answered May 30, 2010 at 22:08

Matti Virkkunen

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