How to attach an attribute to each element in a PHP array

Question

Suppose we have an array with one attribute for each element:

Array ( [0] => A [1] => B [2] => C [3] => D )

Is it possible to add the same uniform attribute to each of the elements, so that a new two-dimensional array would be obtained? I.e. for attribute X:

Array ( [0] => Array ( [0] => A [1] => X)
        [1] => Array ( [0] => B [1] => X)
        [2] => Array ( [0] => C [1] => X) )

I know, I could do it using for each loop, but is there any more elegant solution (such as array_combine)?

(For assigning different values, please refer to: Assigning a value to each array element PHP)

Well, you could use array_merge by typecasting the current value to an array, merge it with an array with "X" allready in there for a single value. Use array_walk to apply this to all parts of the origional array. But I strongly doubt this is worth the effort. What's wrong with good old for loop? Would probably be clearer and cleaner then a very complicated, intelligent looking one-liner. In the end some code back there WILL loop over your initial array, so its not more efficient. — Nanne
– Nanne, Commented Dec 11, 2011 at 14:29

knittl · Accepted Answer · 2011-12-11 14:30:43Z

5

You could use array_map:

$array = array ( 'A', 'B', 'C', 'D' );
$array = array_map(function($el) {
  return array($el, 'X');
}, $array);

answered Dec 11, 2011 at 14:30

knittl

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Aaron W. · Accepted Answer · 2011-12-11 14:32:20Z

1

array_walk could work as well.

$arr = array('A', 'B', 'C', 'D');
array_walk($arr, 'arrFunc');
function arrFunc(&$item, $key)
{
    $item = array($item, 'X'); 
}

answered Dec 11, 2011 at 14:32

Aaron W.

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