What should I do if PHP recursive infinite classification is slow?

1. First decode json into an array, use the json_decode function. Note that you must add the second parameter, otherwise it will return an object. The next step is recursion. This is the simplest recursion that just needs to be traversed one by one.

2. The following is the complete code:

$data= json_decode($str,true); 
$options = getChildren($data); 
function getChildren($parent,$deep=0) { 
foreach($parent as $row) { 
$data[] = array("id"=>$row['id'], "name"=>$row['name'],"pid"=>$row['parentid'],'deep'=>$deep); 
if ($row['childs']) { 
$data = array_merge($data, getChildren($row['childs'], $deep+1)); 
} } 
return $data; 
} 
foreach ($options as $row) { 
echo str_pad("",$row['deep']*3, "-",STR_PAD_RIGHT); 
echo $row['name']; 
} 
?>

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