Just PHP FUN 055.

chessBoard.php

<?php
# https://www.codewars.com/kata/56242b89689c35449b000059 draw me a chessboard.
function chessBoard($rows, $columns) {
  $row = function($a,$b) use ($columns) {
    for($i = 0, $ans = []; $i < $columns; $i += 1 ) array_push($ans, 0 == $i%2 ? $a : $b);
    return $ans;
  };
  for($i = 0, $ans = []; $i < $rows; $i += 1) array_push($ans, 0 == $i%2 ? $row("O","X") : $row("X",'O'));
  return $ans;
}

count_char.php

<?php
# https://www.codewars.com/kata/577ad961ae2807182f000c29 Count the Characters.
function count_char(string $s, string $c): int {
  return substr_count(strtoupper($s),strtoupper($c));
}

generatePairs.php

<?php
# https://www.codewars.com/kata/588e2a1ad1140d31cb00008c Pairs of integers from m to n.
function generatePairs($m,$n){
  $ans = [];
  for($i = $m; $i <= $n; $i += 1)
    for($j = $i; $j <= $n; $j += 1) array_push($ans,[$i,$j]);
  return $ans;
}

gistfile1.txt

<?php
# https://www.codewars.com/kata/58902f676f4873338700011f Lucky Bus Ticket.
function isLucky($ticket){
  $x = preg_match('/^(\d{3})(\d{3})$/',$ticket, $matches);
  if(!$x) return false;
  $sum = function($x){ return array_sum(str_split($x));};
  return $sum($matches[1]) == $sum($matches[2]);
}

just_php_fun_055.md

Just PHP FUN 055.

• https://www.codewars.com/kata/589519d1f0902e01af000054 Perimeter sequence.
• https://www.codewars.com/kata/56242b89689c35449b000059 draw me a chessboard.
• https://www.codewars.com/kata/577ad961ae2807182f000c29 Count the Characters.
• https://www.codewars.com/kata/58902f676f4873338700011f Lucky Bus Ticket.
• https://www.codewars.com/kata/588e2a1ad1140d31cb00008c Pairs of integers from m to n.

Started at 22:21 21.07.2020 Tuesday July.
Finished at 23:19 21.07.2020 Tuesday July. (0hrs 58minutes)

perimeter_sequence.php

<?php
# https://www.codewars.com/kata/589519d1f0902e01af000054 Perimeter sequence.
function perimeter_sequence(int $a, int $n): int {
  return $a*4*$n;
}