Just PHP FUN 054.

annulus_area.php

# https://www.codewars.com/kata/5896616336c4bad1c50000d7 Area of an annulus.
function annulus_area(int $a): float {
  return round(($a/2)**2*pi(),2);
}

arrow_area.php

<?php
# https://www.codewars.com/kata/589478160c0f8a40870000bc Area of an arrow.
function arrow_area(int $a, int $b): float {
 return $a*$b/4;
}

dont_give_me_five.php

<?php
# https://www.codewars.com/kata/5813d19765d81c592200001a Don't give me five!
function dont_give_me_five($start, $end) {
  return count(array_filter(range($start,$end),function($x){ return false === strpos(strval($x),'5');}));
}

getPercentage.php

<?php
# https://www.codewars.com/kata/58a369fa5b3daf464200006c How many e-mails we sent today?
function getPercentage(int $sent, int $limit = 1000): string {
  if(0 == $sent) return "No e-mails sent";
  if($sent >= $limit) return  "Daily limit is reached";
  return floor($sent*100/$limit)."%";
}

just_php_fun_054.md

Just PHP FUN 054.

• https://www.codewars.com/kata/57ad85bb7cb1f3ae7c000039 Numbers with this digit inside.
• https://www.codewars.com/kata/58a369fa5b3daf464200006c How many e-mails we sent today?
• https://www.codewars.com/kata/5813d19765d81c592200001a Don't give me five!
• https://www.codewars.com/kata/5896616336c4bad1c50000d7 Area of an annulus.
• https://www.codewars.com/kata/589478160c0f8a40870000bc Area of an arrow.

Started at 21:20 20.07.2020 July Monday.
Finised at 23:14 20.07.2020 July Monday. (1hrs 54minutes)

numbersWithDigitInside.php

<?php
# https://www.codewars.com/kata/57ad85bb7cb1f3ae7c000039 Numbers with this digit inside.
function numbersWithDigitInside($x, $d) {
    $ans = [];
    for($i = 1; $i <= $x; $i += 1) if(false !== strpos(strval($i),strval($d))) array_push($ans,$i);
    if(empty($ans)) return [0,0,0];
    return [count($ans),array_sum($ans),array_product($ans)];
}