Just PHP FUN 015.

baumSweet.php

<?php
# https://www.codewars.com/kata/5d2659626c7aec0022cb8006 The Baum-Sweet sequence.
function baumSweet() {
  $ans = [];
  for($i = 0; $i <= 1000000; $i += 1){
    if(0 == $i){ $ans[$i] = 1; continue;}
    $ans[$i] = binary($i);
  }
  $counter = 0;
  while(true){
    yield $ans[$counter];
    $counter += 1;
  }
  
}

function binary($x){
  $str = decbin($x);
  $cnt = 0;
  for($i = 0; $i < strlen($str); $i++){
    if("0" == $str[$i]){
      $cnt += 1;
    }else{
      if($cnt > 0 && 1 == $cnt%2) return 0;
      $cnt = 0;
    }
  }
  
  if($cnt > 0 && 1 == $cnt%2) return 0;
  return 1;
}

just_php_fun_016.md

Just PHP FUN 015.

• https://www.codewars.com/kata/56d904db9963e9cf5000037d Thinking & Testing: A and B?
• https://www.codewars.com/kata/51f2b4448cadf20ed0000386 Remove anchor from URL. return strtok($s, "#");
• https://www.codewars.com/kata/5d26721d48430e0016914faa The PaperFold sequence.
• https://www.codewars.com/kata/5d2659626c7aec0022cb8006 The Baum-Sweet sequence.
• https://www.codewars.com/kata/589573e3f0902e8919000109 Simple Fun #87: Shuffled Array.

Started at 20:57 04.06.2020 Thursday June.
Finished at 2:23 05.06.2020 Thursday June. (5hrs 26minutes).

paperFold.php

<?php
# https://www.codewars.com/kata/5d26721d48430e0016914faa The PaperFold sequence. 
function paperFold() {
  $ans = [1];
  $size = 1;
  while($size <= 1000000){
      $tmp = array_map(function($x){ return 1 == $x ? 0 : 1;},array_reverse($ans));
      $ans = array_merge($ans,[1],$tmp);
      $size = count($ans);
    }
    $counter = 0;
    while(true){
      yield $ans[$counter];
      $counter += 1;
    }
}

replaceAll.php

<?php
# https://www.codewars.com/kata/51f2b4448cadf20ed0000386 Remove anchor from URL.
function replaceAll($string) {
  return preg_replace('/#.*$/','',$string);
}

shuffledArray.php

<?php
# https://www.codewars.com/kata/589573e3f0902e8919000109 Simple Fun #87: Shuffled Array.
function shuffledArray($arr){
  $sum = array_sum($arr);
  $i = array_search($sum/2,$arr);
  $a =  array_slice($arr,0,$i);
  $b = array_slice($arr,$i+1);
  $answer = array_merge($a,$b);
  sort($answer);
  return $answer;
  
}

testit.php

<?php
# https://www.codewars.com/kata/56d904db9963e9cf5000037d Thinking & Testing: A and B?
function testit($a,$b)
{
  return $a|$b;
}