Order an associative array by a specific column.

order_associative_array_by_a_specific_column.php

<?php // On this example I'm extracting all the WordPress categories from a parent category and order them by an additional custom field named "order" assigned to the category taxonomy. ?>
<?php 
    $siblings = get_term_children($current_cat->term_id, 'category');
    $siblings_list = array( array() );	
    $i=0;
    foreach ($siblings as $sibling) {
        $sibling_object = get_term_by( 'id', $sibling, 'category');
        $siblings_list[$i]['name'] = $sibling_object->name;
        $siblings_list[$i]['url'] = get_term_link( $sibling, 'category');
        $siblings_list[$i]['order'] = get_field('order', $sibling_object->taxonomy.'_'.$sibling_object->term_id);
        $siblings_list[$i]['image'] = get_field('image', $sibling_object->taxonomy.'_'.$sibling_object->term_id);
        $i++;
    }

    // sort the array by the order
    $order = array();
    foreach ($siblings_list as $key => $row) {
        $order[$key]  = $row['order'];
    }
    array_multisort($order, SORT_ASC, $siblings_list); ?>

<?php for($k=0; $k<sizeof($siblings_list); $k++) { // echo the sorted array ?>
        <a class="child_page_link <?php if($current_cat->name==$siblings_list[$k]['name']) echo 'current'; ?>" href="<?php echo $siblings_list[$k]['url']; ?>" title="<?php echo $siblings_list[$k]['name']; ?>" style="background-image:url('<?php echo $siblings_list[$k]['image']; ?>');"><?php echo $siblings_list[$k]['name']; ?></a>
<?php } ?>