Just PHP FUN 014.

getMiddle.php

<?php
# https://www.codewars.com/kata/56747fd5cb988479af000028 Get the Middle Character.
function ($text) {
  $last = strlen($text) - 1;
  if(0 == $last%2) return substr($text,$last/2,1);
  return substr($text, floor($last/2),2);
}

just_php_fun_014.md

Just PHP FUN 014.

• https://www.codewars.com/kata/56747fd5cb988479af000028 Get the Middle Character.
• https://www.codewars.com/kata/5868812b15f0057e05000001 Tail Swap.
• https://www.codewars.com/kata/57ebaa8f7b45ef590c00000c Numbers to Letters.
• https://www.codewars.com/kata/57eba158e8ca2c8aba0002a0 Sort by Last Char.
• https://www.codewars.com/kata/57e8f757085f7c7d6300009a Holiday II - Plane Seating.

Started at 2020.06.03 Wednesday June. Finished at 2020.06.03 23:29 Wendesay June. (3hrs 00minutes)

last.php

<?php
# https://www.codewars.com/kata/57eba158e8ca2c8aba0002a0 Sort by Last Char.
function last($x)
{
   $array = explode(" ",$x);
   $cmp = function($a,$b){
    $a1 = substr(strrev($a),0,1);
    $b1 = substr(strrev($b),0,1);
    if($a1 == $b1) return 0;
    if($a1 > $b1) return 1;
    return - 1;
   };
   usort($array,$cmp);
   return $array;
}

planeSeat.php

<?php
#  https://www.codewars.com/kata/57e8f757085f7c7d6300009a Holiday II - Plane Seating.
function planeSeat($a){
  $char = preg_replace('/[0-9]+/',"",$a);
  $number = (int) preg_replace('/[A-Z]/',"",$a);
  echo "char = ($char) number = ($number)\n";
  if(60 < $number) return "No Seat!!";
  if("I" == $char || "J" == $char || "K" < $char || "" == $char) return "No Seat!!";
  $x = "";
  if("A" <= $char && $char <= "C") $x = "Left";
  if("D" <= $char && $char <= "F") $x = "Middle";
  if("G" <= $char && $char <= "K") $x = "Right";
  $y = "";
  if(1 <= $number && $number <= "20") $y = "Front";
  if(21 <= $number && $number <= "40") $y = "Middle";
  if(40 <= $number && $number <= "60") $y = "Back";
  return "$y-$x";
}

switcher.php

<?php
# https://www.codewars.com/kata/57ebaa8f7b45ef590c00000c Numbers to Letters.
function switcher($arr)
{
  $map = function($x){
    if( 1 <= $x && $x <= 26) return chr(ord('a') + 26 - $x);
    if( '27' == $x) return "!";
    if( '28' == $x) return "?";
    if( 29 == $x) return " "; 
  };
  return implode(array_map($map,$arr));
}

tail_swap.php

<?php 
# https://www.codewars.com/kata/5868812b15f0057e05000001 Tail Swap.
function tail_swap(array $a): array {
  list($a0,$b0) = explode(":",$a[0]);
  list($a1,$b1) = explode(":",$a[1]);
  return [ $a0.":".$b1, $a1.":".$b0];
}

https://www.php.net/manual/en/function.strstr.php

$alphabet = array_reverse(range("a", "z"));