Just PHP FUN 016.

geometric_sequence_elements.php

<?php
# https://www.codewars.com/kata/55caef80d691f65cb6000040 Geometric Progression Sequence.
function geometric_sequence_elements(int $a, int $r, int $n): string {
  $get = function() use ($a,$r,$n){ 
    $tmp = $a;
    for($i=0; $i<$n; $i += 1){
      yield $tmp;
      $tmp *= $r;
    }
  };
  return implode(", ",iterator_to_array($get()));
}

gps.php

<?php
# https://www.codewars.com/kata/56484848ba95170a8000004d Speed Control.
function gps($s, $x) {
    $size = count($x);
    $answer = [];
    for($i=1; $i < $size; $i += 1){
      $answer[] = (3600 * ($x[$i]-$x[$i-1]))/$s;
    }
    return floor(max($answer));
}

just_php_fun_016.md

Just PHP FUN 016.

• https://www.codewars.com/kata/58d3487a643a3f6aa20000ff MinMinMax.
• https://www.codewars.com/kata/55caef80d691f65cb6000040 Geometric Progression Sequence.
• https://www.codewars.com/kata/56484848ba95170a8000004d Speed Control.
• https://www.codewars.com/kata/566fc12495810954b1000030 Count the Digit.
• https://www.codewars.com/kata/567501aec64b81e252000003 Easy wallpaper.

Started 20:57 05.06.2020 Friday June. Finised 01:05 06.06.2020 Saturday June. (4hrs 8 minutes)

minminmax.php

<?php
# https://www.codewars.com/kata/58d3487a643a3f6aa20000ff MinMinMax.
function minMinMax($array) {
  $min = min($array);
  $max = max($array);
  $tmp = array_flip($array);
  $min2 = 0;
  for($i = $min+1; $i < $max; $i += 1){
    if(! isset($tmp[$i])){
      $min2 = $i;
      break;
    }
  }
  return [$min,$min2,$max];
}
 

nbDig.php

<?php
# https://www.codewars.com/kata/566fc12495810954b1000030 Count the Digit.
function nbDig($n, $d) {
    $ans = 0;
    for($i = 0; $i <= $n; $i++){
     $ans += substr_count($i*$i,$d);
    }
    return $ans;
}

wallPaper.php

<?php
function wallPaper($l, $w, $h) {
    $ans = ['zero',
    'one',
    'two',
    'three',
    'four',
    'five',
    'six',
    'seven',
    'eight',
    'nine',
    'ten',
    'eleven',
    'twelve',
    'thirteen',
    'fourteen',
    'fifteen',
    'sixteen',
    'seventeen',
    'eighteen',
    'nineteen',
    'twenty'];
    
    $total = 2*($l+$w)*$h*1.15 / (10*0.52);
    $number = ceil($total);
    //echo "number = $number ($total) \n";
    return $ans[$number];
}

current(array_diff(range($min, $max), $array))

https://www.codewars.com/users/Pcheliakov

http://remyhonig.github.io/blog/generator-vs-array_map/

$seq[] = $a *= $r;