Rearrange array in php

I have dynamic array like this

$color[0] = 'Red'
$color[1] = 'Green'
$color[2] = 'Blue'
$color[3] = 'black'
$color[4] = 'white'

I want to move "black" to first index of the array and move "Red" to down at index 2. How can i do this? Any code snippet or article?

 

Here's php's array functions. I don't think there is a way to do it without some logic within a function.

http://www.php.net/manual/en/ref.array.php

 

This should work

	  function moveToFirst(&$array, $str)
	  {
		  	$key=array_search($str,$array);
			if($key) unset($array[$key]);
			array_unshift($array,$str);  
			return $array;
	  }

PHP:

I also tried a function that reorders the whole array with a foreach but this one was a lot faster.