Sorting an array by index value with given order

Question

Perhaps the title didn't make much sense, but what I actually want to achieve is to sort an array by its index using an array with the sorting values:

$sortingValues = array(
    'category-1',
    'category-2',
    ...
    'category-9',
);
$categories['category-1'][] = $article;
$categories['category-2'][] = $article;
...
$categories['category-9'][] = $article;

What I want to achieve is to sort $categories with the sorting values in $sortingValues.

busypeoples · Accepted Answer · 2012-02-18 18:32:31Z

1

$sortingValues = array( 'category-1', 'category-4', 'category-2', 'category-9');
$categories = array( 'category-1' => 'cat1', 'category-2' =>'cat2', 'category-4' => 'cat4', 'category-9'=>'cat9');

//

foreach($sortingValues as $cat) {
  if(array_key_exists($cat, $categories)) {
   print $categories[$cat] . "\n"; 
  }
}

answered Feb 18, 2012 at 18:32

busypeoples

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piotrm · Accepted Answer · 2012-02-18 21:32:03Z

0

function cmp_sortingValues( $a, $b ) {
  global $sortingValues;
  if( $a == $b ) return 0;
  $apos = array_search( $a, $sortingValues );
  $bpos = array_search( $b, $sortingValues );
  return ( $apos>$bpos ) ? 1 : -1;
}

uksort( $categories, "cmp_sortingValues" );

answered Feb 18, 2012 at 21:32

piotrm

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2 Comments

N.B. Over a year ago

We all know that using globals is bad practice. Why not pass the sorting array to the function instead?

piotrm Over a year ago

It is uksort that calls your function and it passes only 2 keys for comparison.

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