Help with PHP Script

jakeruston

Hi,

I have a file saved which is a huge list of URLs in. All URLs have one thing in common, they all have ?p= in the URL, and then a number. Eg.

?p=3
?p=48
?p=344

I need a PHP Script which finds the ?p= string on each line and then returns just the number afterwards, so for example if a URL was:

http://www.google.com/?p=47

It would return the number 47 on the page. I need it to do that on each line.

I'm a decent coder but I'm just struggling on ideas of how to achieve it.

Thanks.

etully

If you know that the p=### will always be the only argument in the URL, I would use this:

$x="http://www.google.com/?p=23";
preg_match("/\?p=([0-9]+)$/",$x,$regs);
echo $regs[1]."\n\n";

But if the p=### might be in the middle of a list of arguments in the URL like this:
http://www.google.com/?x=1&y=2&p=23&z=17
then I would use something like this:

$x="http://www.google.com/?x=1&p=23&z=123";
preg_match("/[^a-zA-Z]p=([0-9]+)/",$x,$regs);
echo $regs[1]."\n\n";

These are called Regular Expressions. They are good for finding stuff in strings.

Weedpacket

The [man]parse_url[/man] and [man]parse_str[/man] functions were made for this sort of thing.