A sort function which use a custom order

sort-by-own-order.php

<?php

static $aTypesOrder = array(
    'PDF', 'DOC', 'BMP', 'PSD', 'AI',
);

/**
 * @param array $aAssetA
 * @param array $aAssetB
 *
 * @return int
 */
function _sortByOwnOrder(array $aElementA, array $aElementB) {
    global $aTypesOrder;
    
    $iIndexA = array_search($aElementA['type'], $aTypesOrder);
    $iIndexB = array_search($aElementB['type'], $aTypesOrder);
    
    if($iIndexA === $iIndexB){
        return 0;
    } else if($iIndexA < $iIndexB){
        return -1;
    } else {
        return 1;
    }
}