PHP - concatenate in recursive function

Question

I have function like this:

function getTree($r, $html) {
            foreach ($r as $entry) {
                if (count($entry['children']) == 0) {
                        $html .= '<li>' . $entry['parent_entry_id'] . '</li>';
                    } else {
                        getTree($entry['children'], $html);
                    }
                    //var_dump($html);
                }
                return $html;
            }

If I call it like this

$html = '';
$dzoni = getTree($results, $html);
echo $dzoni;

E expect to get few list elements But I get empty string. It is not problem with the data. If I var_dump them I get the result. But result does not concatenate all the time. It simply stops at some point. var_dump example:

C:\wamp64\www\co_3\regular_view.php:72:string '<li>17</li>' 
C:\wamp64\www\co_3\regular_view.php:72:string '<li>17</li><li>18</li>' 
C:\wamp64\www\co_3\regular_view.php:72:string '<li>22</li>'

What am I doing wrong?

jspcal · Accepted Answer · 2018-06-10 21:03:10Z

3

When you recurse, you need to use the return value instead of discarding it:

getTree($entry['children'], $html);

Should be something like:

$html = getTree($entry['children'], $html);

edited Jun 10, 2018 at 21:03

answered Jun 10, 2018 at 20:55

jspcal

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