aierui

<?php

if (!function_exists('interface_exists')) {
    die('PHP version too old');
}
$throwables = listThrowableClasses();
$throwablesPerParent = splitInParents($throwables);
printTree($throwablesPerParent);
if (count($throwablesPerParent) !== 0) {
    die('ERROR!!!');

aierui

// some unique snippets

var unique = function(a) {
  return Array.from(new Set(a));
}


var unique = function (a){
  a.filter(function(ele,index,array){
      return index===array.indexOf(ele)