Is there a better/elegant way of setting array keys to related values?

Let's say, I've got an array that looks like this:

    [0] => red
    [1] => green
    [2] => blue

I want the keys of this array to be the same as the related values. So the result should look like this:

    [red] => red
    [green] => green
    [blue] => blue

The values of the initial array will be unique, so this is not an issue.

To get the result, I would normally use a foreach loop:

$aResult = array();
foreach($aColors as $sValue)
  $aResult[$sValue] = $sValue;

My the question is: Is there a better/elegant way of doing this ?

Edit: Many of you want to know why I need an array like this. So I'll explain. I'm using a framework, which generates a select box for me. The function uses array keys and values to apply them to the select options like so:

  <option value="red">red</option>
  <option value="green">green</option>
  <option value="blue">blue</option>

In this case the keys would match the values.


$aResult = array_combine($aColours, $aColours);

But its pretty pointless to do so because it doesn't give you anything that your original array doesn't already give you.


You may also find the following variants useful:

$aColours = array('red','orange','yellow','green','blue','indigo','violet');

$aResult = array_combine(


uses the lower-case values defined in your initial array for the keys, but generates upper-case first letter for the display values

$aColours = array('Red','Orange','Yellow','Green','Blue','Indigo','Violet');

$aResult = array_combine(


Uses mixed-case display values defined in your initial array for the values, but generates lower-case for the keys

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