[SOLVED] I need help shiftng an array

[Salis]

I'm having a little trouble writing a script that reorders an array. For an example, let's say I have the following array:

 

Blue

Red

White

Yellow

Black

 

Now, what I want to do is move "Yellow" before "Red" I know that "Yellow" will now take the place of "Red" and 1 should be subtracted to the index of each color until the value "Yellow" used to hold.

 

0 = Blue

1 = Red

2 = White

3 = Yellow

4 = Black

 

I'm guessing any way, the process would be like this:

 

0 + 0

1 = 3

2 - 1

3 - 1

4 - 0

 

This should shift the array to look like:

 

Blue

Yellow

Red

White

Black

 

or is there an easier way?

 

Thanks

[cooldude832]

are you looking for a random sort/shift or is there a calculated one based on the keys or what?

[Salis]

No, ordered. I've been working in VB lately, Keys to index...

 

Any way, Yellow is #3 in the array and Red is #1. I want to "move" Yellow before Red.

[liebs19]

I would write a loop, that copies the array into a new array. Then check each time to see if you are the the point to insert yellow. Then insert yellow, then just cop the rest in at its new position 1 spot back.

[cooldude832]

You can sort by a function usign unisort but this isn't exactly a normal function because its not based on y=mx+b where y is the final key m is some slope x is the inital key and B is a constant, here you are moving the keys in a sort of floating pattern.

[Salis]

People can to this very easily. If we look at

 

0 - Blue

1 - Red

2 - White

3 - Yellow

4 - Black

 

And want to move Yellow before Black we know that the list will look like

 

0 - Blue

1 - Yellow

2 - Red

3 - White

4 - Black

 

But to do this in an array, I'd have to list all colors as a key, then their integer as a value. Then add 1 to the array_value up to the Yellows old value.. if that makes any since.... so

 

array('balck'=>0, 'red'=>1, 'white'=>2, 'yellow'=>3, 'black'=>4)... I don't really know, thinking out loud here. Maybe one of you can come up with something

 

Or what if I assign the colors a number and list the values like so.

array(0=>0, 1=>2, 2=>3, 3=>2, 4=>4)

 

the keys are the original order and the values are the new number... But I still need a way to add 1...

 

I hope I'm not confusing any one.

[Jessica]

Do you need them to keep the original keys?

[Jessica]

See:

http://grady.us/temp/colors.php

 

<?php
$colors = array('Blue', 'Red', 'White', 'Yellow', 'Black');
$move = 'Yellow';
$before = 'Red';

//Remove the color you want to move.
unset($colors[array_search($move, $colors)]);

//Slice out an array from the spot you want to put the color until the end.
$endHalf = array_slice($colors, array_search($before, $colors));

//Take out the first half
$firstHalf = array_slice($colors, 0, (count($colors)-count($endHalf)));

//Assemble the new array
$colors = array_merge($firstHalf, array($move), $endHalf);
?>

[Salis]

Thank you so much. This helps a lot!

 

I started working with a for statement to match keys and values then go through an if else statement.....

 

Your code works much better!

 

Thanks jesirose and everyone.

[Jessica]

No problem. It was a fun challenge.