shifting arrays

[eikyuu]

Hello,

I may just be a little stupid ...

lets say I have an array $raw_arr = array("entry1","entry2,"entry3,"entry4")

and now users can change the order and have a form where they may enter the new position like entry4 shall be on the first position and the rest moves down.

so now, how do I create a new array that looks like $new_arr = array("entry4","entry1","entry2","entry3")

any suggestions apart from (are u stupid? read the manual) are highly welcome. 🙂

regards

-anja

[[deleted]]

Are you stupid? read the manual!

aahh... feels good to shout that every now and then.

But it is quite correct, the manual does have a sh*tload of functions for arrays, including such goodies as
array_unshift() to add a new element to the beginning of the array, and array_pop() to take one elelent off the end of an array, and the ever-complex array_slice() and array_splice()

The thing to note is that you don't have to shift elements around at all. You can always just create a new array and fill that by picking the elements from the old array in the right order.

In your example you can either pop element4 off the end and unshift it into the beginning, or you can create a new array that contains element4 plus elements 1 through 3. Same effect, but possibly a lot easier to implement.

---

A forum, a FAQ, what else do you need?

Time to YAPF!: http://www.hvt-automation.nl/yapf/

[eikyuu]

um, yes, I read the manual, ... didn't do me much good

okay, moving something to pos 1 may be easier ... another example

entry1
entry2
entry3
...4
...5
...6

now move entry5 to position 2

like
entry1
entry5
entry2
entry3
entry4
entry6

how do i do it?

anja - feeling stupid - gruss

[[deleted]]

Ow I'm good...

echo '<pre>';

$aOrig = array(1,2,3,4,5,6);
print_r($aOrig);

// Position of element to swap
$iOldPos = 1;

//Position of element to swap with
$iNewPos = 2;

// Remove he element from the old location
$mElement = array_splice($aOrig, $iOldPos, 1);

print_r($aOrig);

// Insert the element back at the new position
$aNewArray = array_splice($aOrig, $iNewPos, 0, $mElement);

print_r($aOrig);

exit;

---

A forum, a FAQ, what else do you need?

Time to YAPF!: http://www.hvt-automation.nl/yapf/