This is a PHP snippet on how to get all the triats of an ontology given its name:

gistfile1.aw

<?php
class traits {
    var $url = 'http://www.cropontology-curationtool.org';

    function get_children($parent_id) {
        $children = json_decode(file_get_contents($this->url. '/get-children/' . $parent_id));
        foreach($children as $child) {
            if($child->has_children > 0) {
                $child->children = $this->get_children($child->id);
            }
        }
        return $children;
    }

    function traits($crop) {
        $this->crop = $crop;
    }

    function get() {
        $ontology_id = file_get_contents($this->url . '/get-ontology-id?ontology_name=' . $this->crop);
        $onto_roots = json_decode(file_get_contents($this->url . '/get-ontology-roots/' . trim($ontology_id)));
        $arr = array();
        foreach($onto_roots as $onto) {
            $arr[$onto->name] = $this->get_children($onto->id);
        }
        return $arr;
    }
}

$traits = new traits('Cassava');
print_r($traits->get());
?>