Where to pass temp array when using recursive function? - php

Question

I'm using a foreach loop inside my recursive function. But I have trouble figuring out where to pass my return statement. I need to return my temp array at some point, but I'm not sure how to do this:
<?php
$patterns = function($array, $temp = array(), $i = 0, $id = 0, $parent = 0) use(&$patterns) {
$return = null;
if(array_key_exists($i, $array)) {
foreach($array[$i] as $set) {
if($parent == $set['id']) {
$data = array(
'id' => $set['id'],
'parent' => $set['parent']
);
array_push($temp, $data);
}
$patterns($array, $temp, $i + 1, $set['id'], $set['parent']);
}
}
};
print_r($patterns($rev_relations));
?>
This is my data:
Array(
[0] => Array(
[0] => Array(
[id] => 60
[parent] => 55
)
[1] => Array(
[id] => 57
[parent] => 54
)
)
[1] => Array(
[0] => Array(
[id] => 61
[parent] => 50
)
[1] => Array(
[id] => 54
[parent] => 49
)
)
[2] => Array(
[0] => Array(
[id] => 49
[parent] => 0
)
)
)

Answer 1

<?php
//pass $temp by reference so outside variable gets populated
$patterns = function($array, &$temp, $i = 0, $id = 0, $parent = 0) use(&$patterns) {
$return = null;
if(array_key_exists($i, $array)) {
foreach($array[$i] as $set) {
if($parent == $set['id']) {
$data = array(
'id' => $set['id'],
'parent' => $set['parent']
);
array_push($temp, $data);
}
$patterns($array, $temp, $i + 1, $set['id'], $set['parent']);
}
}
};
//actuall array is created on temp here
$temp=array();
$patterns($rev_relations,$temp);
?>
wont this work? Never really worked with nameless functions, but this is how i would go about it on a normall recursive function
Ok, take two
<?php
$patterns = function($array, $temp = array(), $i = 0, $id = 0, $parent = 0) use(&$patterns) {
$return = null;
if(array_key_exists($i, $array)) {
foreach($array[$i] as $set) {
if($parent == $set['id']) {
$data = array(
'id' => $set['id'],
'parent' => $set['parent']
);
array_push($temp, $data);
}
return $patterns($array, $temp, $i + 1, $set['id'], $set['parent']);
}
}
else
{
return $temp;
}
};
$patterns($rev_relations);
?>