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)?

Answer 1

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

Answer 2

Try this regular expression:

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

Answer 3

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

And the same in English:

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

Answer 4

Try this function:

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

Answer 5

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