Just PHP FUN 010.

automorphic.php

<?php
# https://www.codewars.com/kata/5a58d889880385c2f40000aa Automorphic Number (Special Numbers Series #6).
function automorphic($n) {
  if($n == substr($n*$n,- strlen($n))) return "Automorphic";
  return "Not!!";
}

disariumNumber.php

<?php
# https://www.codewars.com/kata/5a53a17bfd56cb9c14000003 Disarium Number (Special Numbers Series #3).
function calc($n){
  $sum = 0;
  $a = str_split($n);
  foreach($a as $i=>$v){
    $sum += pow($v,$i+1);
    if($n < $sum) return false;
  }
  if($n != $sum) return false;
  return true;
}
function disariumNumber($n) {
  return calc($n) ? "Disarium !!" : "Not !!";
}

just_php_fun_010.md

Just PHP FUN 010.

• https://www.codewars.com/kata/5a53a17bfd56cb9c14000003 Disarium Number (Special Numbers Series #3).
• https://www.codewars.com/kata/5a87449ab1710171300000fd Tidy Number (Special Numbers Series #9).
• https://www.codewars.com/kata/5a63948acadebff56f000018 Product Of Maximums Of Array (Array Series #2).
• https://www.codewars.com/kata/5a55f04be6be383a50000187 Special Number (Special Numbers Series #5).
• https://www.codewars.com/kata/5a58d889880385c2f40000aa Automorphic Number (Special Numbers Series #6).

Started at 29.05.2020 21:10 Friday May.
Finished at 29.05.2020 22:06 Friday May. (0hrs 54minues)

maxProduct.php

<?php
# https://www.codewars.com/kata/5a63948acadebff56f000018 Product Of Maximums Of Array (Array Series #2).
function maxProduct($arr, $size) {
  rsort($arr);
  return array_product(array_slice($arr,0,$size));
}

specialNumber.php

<?php
# https://www.codewars.com/kata/5a55f04be6be383a50000187 Special Number (Special Numbers Series #5).
function specialNumber($n) {
  return boolval(preg_match('/^[0-5]+$/',strval($n))) ? "Special!!" : "NOT!!";
}

tidyNumber.php

<?php 
# https://www.codewars.com/kata/5a87449ab1710171300000fd Tidy Number (Special Numbers Series #9).
function tidyNumber($n) {
  $a = str_split($n);
  for($i=1; $i<count($a); $i++)
    if($a[$i-1] > $a[$i]) return false; 
  return true;
}
# -------------------------------------------
function tidyNumber($n) {
  $n = str_split($n); $a = $n;
  sort($a);
  return $a == $n ? true : false;
}
# ------------------------------------------
function tidyNumber($n) {
  $n = str_split($n); $a = $n;
  sort($a);
  return $a == $n;
}