Hi everybody!
I have a question concering arrays..
Say I have the following array:
(1,12)
(1,13)
(2,14)
(2,15)
(2,3)
(2,16)
(3,15)
(3,3)
(3,20)
(3,5)
(3,6)
(3,20)
Everything is OK except that pair (3,20) is repeated twice. How can I avoid it? 'Map' function is the answer?
Abhishek Reddy posted this at 03:53 — 28th January 2006.
He has: 3,303 posts
Joined: Jul 2001
Map is used to run parameters through a given expression (could be a function, for example). You could probably write a solution to test for duplicates yourself using map, but that would be reinventing the wheel.
I gather you are trying to make what's called a 'set', which is a list containing no duplicate entries. You can use Ron Savage's Set::Array module to do things with your arrays to make sets or identify duplicates or whatever you need specifically.
abhishek.geek.nz
MyFreeCounter posted this at 02:57 — 7th February 2006.
They have: 7 posts
Joined: Jan 2006
to check if an element is in the array already, check it using in_array first, only insert if it returns false (http://us2.php.net/in_array). Also, if you want to get rid of duplicate entries, you can run array_unique to return only one of each element in the array. (http://us2.php.net/array_unique)
timjpriebe posted this at 16:44 — 7th February 2006.
He has: 2,666 posts
Joined: Dec 2004
If you can, post the code you're working with. That would help us help you better.