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function diagonalDifference($arr) {
    //initialize a new array to hold the diagonals, left and right
    $rightD = [];
    $leftD  = [];

    //iterate through the parent array, taking note of it's key
    foreach($arr as $key => $lineArray)
    {
        //iterate through the diagonal lines, take note of the keys
        foreach ($lineArray as $innerKey => $value){

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function miniMaxSum($arr) {

    $sumValue = [];

    foreach($arr as $key => $integer)
    {
        $sumValue[] = array_sum(array_filter($arr, function($innerKey) use ($key){
            return $innerKey !== $key;
        },ARRAY_FILTER_USE_KEY));
    }

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//PROBLEM
//There is a large pile of socks that must be paired by color. 
//Given an array of integers representing the color of each sock, 
//determine how many pairs of socks with matching colors there are.

//More details about problem can be found here
//https://www.hackerrank.com/challenges/sock-merchant/problem?h_l=interview&playlist_slugs%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D=warmup

function sockMerchant($n, $ar) {
     // Get the unique version of the array and the count of value appearance.

elishaukpong

<!-- Staircase detail

This is a staircase of size 4: 

   #
  ##
 ###
####
Its base and height are both equal to . It is drawn using # symbols and spaces. The last line is not preceded by any spaces.

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<?php

class Food
{
}

class AnimalFood extends Food
{
}

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<?php

//a boy has two shows and can decide to wear anyone of it at any time,
//the below class shows the implementation without applying any design patterns

class ShoeWithoutFactory
{
    const CHURCH = 1;
    const SCHOOL = 2;

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<?php


class Browser
{
    public static function browse($callable)
    {
        $params = (new ReflectionFunction($callable))->getParameters();
        $args = [];

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<?php

class Person{
    public $name;

    public function __construct(string $name){
        $this->name = $name;
    }
}

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<?php

//NULLSAFE OPERATOR

//class User {
//    public function profile(){
//        return new Profile;
//    }
//}
//

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<!--
 Copyright 2018 Google Inc.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software