[RESOLVED] short array

[alq]

Hello,
I have

$a=array("dog","cat","horse","lion");

What function to use if i want to short $a starting from "cat" followed by all the element found after "cat" and all the element found before "cat".
On the output to be something like this:

Array ( [1] => cat [2] => horse [3] => lion [0] => dog ) 

[bretticus]

I assume you are looking for a rotation sort (not alphabetical or numerical)

One way to go about it is to use several functions:

<?php
// original array
$a=array('dog','cat','horse','lion');
// find position of 'cat' in array.
$pos = array_search('cat', $a);
// slice a hunk off array from position found
$b = array_slice($a, $pos);
// merge the new "sliced" array with what's left of original array coming after.
$c = array_merge($b, $a);
print_r($c);
?>

[alq]

Thank you for your reply.

Yes, this is what I'm looking for, a rotation sort.

In your example the only problem is that $a is added after the sliced part and it should only add "dog" from $a.

I found uasort()... i think it could do that.
There is this example on w3school but i don't really get it how it's working, especially the "? -1 : 1;" part

[HalfaBee]

If you only want to rotate the array you can do this.

$a[] = array_shift( $a );

[alq]

In the end i made my own function

<?php
function rotate_array($array,$element)
{
    $first = array_search($element,$array);
    $sl1 = array_slice($array,$first);
    $sl2 = array_slice($array,0,$first);
    $merge = array_merge($sl1,$sl2);
    return $merge;
}
$a = array(0 => "Dog",1 => "Cat",2 => "Horse",3 => "Bird",4 => "Lion");
$first_element = "Bird";
$rotate_array = rotate_array($a,$first_element);
print_r($rotate_array);
?>

Output:

Array ( [0] => Bird [1] => Lion [2] => Dog [3] => Cat [4] => Horse ) 

[bretticus]

alq;10888288 wrote:

Thank you for your reply.

Yes, this is what I'm looking for, a rotation sort.

In your example the only problem is that $a is added after the sliced part and it should only add "dog" from $a.

I found uasort()... i think it could do that.
There is this example on w3school but i don't really get it how it's working, especially the "? -1 : 1;" part

Hmmm, wonder if there was a subtle (actually major) difference in compilers, my code in my compiler actually just left 'dog' in $a after calling array_slice. Glad you got something that works for you.