Remove empty values from an array.

remove_empty_values.php

<?php
/**
 *  Remove empty values from an array.
 *
 *  @param   array  $arr  The array to remove values from
 *  @return  array        The new array without the empty values
 */
function remove_empty_values( $arr ) {
    if( ! is_array( $arr ) ) return $arr;

    $non_empty_items = array();

    foreach( $arr as $key => $value ) {
        if( $value && ! empty( $value ) ) {
            $non_empty_items[$key] = remove_empty_values( $value );
        }
    }

    return array_filter( $non_empty_items );
}