blog post: repeated character

solution.php

<?php

// Blog post: "letra repetida site:juque.cl" <-- google it :)

function solution(string $s): string
{
   $charFrequencies = [];
   $inputArray = str_split($s);
   $inputLength = count($inputArray);

   for ($i = 0; $i < $inputLength; $i++) {
      $char = $inputArray[$i];
      if (!isset($charFrequencies[$char])) {
        $charFrequencies[$char] = 0;
      }
      $charFrequencies[$char]++;
   }

   $maxFrequency = 0;
   foreach ($charFrequencies as $freq) {
     if ( $freq > $maxFrequency) {
       $maxFrequency = $freq;
     }
   }

   $result = '';
   foreach ($charFrequencies as $char => $freq) {
     if ($freq === $maxFrequency) {
       $result = $char;
     }
   }

   return $result;
}