Sorting an associative array in PHP [duplicate]
Use usort
and supply your own function to do the ordering, e.g.
function cmp($a, $b)
{
return $b['avgSearchVolume'] - $a['avgSearchVolume'];
}
usort($array, "cmp");
Until PHP 5.3 this is the best function for sorting based on subkeys without making a new function for each key.
function sortBySubkey(&$array, $subkey, $sortType = SORT_ASC) {
foreach ($array as $subarray) {
$keys[] = $subarray[$subkey];
}
array_multisort($keys, $sortType, $array);
}
sortBySubkey($arr, 'avgSearchVolume');
With PHP 5.3 you can make something like this, same function call as now.
function getSortVariable($sortType = SORT_ASC) {
switch($sortType) {
case SORT_ASC:
return function ($a, $b) use ($subkey) { return strcmp($a[$subkey], $b[$subkey]); };
}
}
function sortBySubkey(&$array, $subkey, $sortType = SORT_ASC) {
$sortFunction = getSortVariable($sortType);
usort($array, $sortFunction($subkey));
}