I have the following custom function in PHP / Wordpress.
function GetAncestors($post_id, $ancestors = array()) {
$query = 'SELECT `wp_terms`.term_id, `wp_terms`.name, `wp_term_taxonomy`.parent FROM `wp_terms` LEFT JOIN `wp_term_taxonomy` ON `wp_terms`.term_id = `wp_term_taxonomy`.term_id WHERE `wp_terms`.term_id = '.$post_id;
$term_data = RunQuery($query)[0];
array_push($ancestors,$term_data);
if($term_data[parent]!='11') GetAncestors($term_data[parent],$ancestors);
else print_r($ancestors);
//else return $ancestors;
}
If I print_r the array, it returns the expected result. If I return the value of the array and print_r it outside of the function (which is what I want to do), it returns a blank string.
Results from print_r:
Array ( [0] => Array ( [term_id] => 95 [name] => PDR (Appraisals) [parent] => 91 ) [1] => Array ( [term_id] => 91 [name] => Your career, learning and development [parent] => 14 ) [2] => Array ( [term_id] => 14 [name] => You At ... [parent] => 11 ) )
Why is this?
Shouldn't it be like this:
// Changed ancestors to reference
// Changed constant 'parent' to string
function GetAncestors($post_id, &$ancestors = array()) {
$query = 'SELECT `wp_terms`.term_id, `wp_terms`.name, `wp_term_taxonomy`.parent FROM `wp_terms` LEFT JOIN `wp_term_taxonomy` ON `wp_terms`.term_id = `wp_term_taxonomy`.term_id WHERE `wp_terms`.term_id = '.$post_id;
$term_data = RunQuery($query)[0];
array_push($ancestors,$term_data);
if($term_data['parent']!='11') {
GetAncestors($term_data['parent'],$ancestors);
}
}
$ancestors = array();
GetAncestors($id, $ancestors);
print_r($ancestors);
Personally I'd write it like this for utility:
function GetAncestors($post_id, &$ancestors = null) {
if (null === $ancestors) {
$ancestors = array();
}
$query = 'SELECT `wp_terms`.term_id, `wp_terms`.name, `wp_term_taxonomy`.parent FROM `wp_terms` LEFT JOIN `wp_term_taxonomy` ON `wp_terms`.term_id = `wp_term_taxonomy`.term_id WHERE `wp_terms`.term_id = '.$post_id;
$result = RunQuery($query);
if (count($result) > 0) {
$count = 1;
$term_data = $result[0];
array_push($ancestors,$term_data);
if($term_data['parent']!='11') {
$count += GetAncestors($term_data['parent'],$ancestors);
}
return $count;
}
return 0;
}
if (GetAncestors($id, $ancestors) > 0) {
print_r($ancestors);
}
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