Get Appearance Count

getAppearanceCount.php

<?php
function appearanceCount($str1len, $str2len, $str1, $str2)
{
  $matches = $chunk = $i = 0;
  $str1len = strlen($str1);
  $str2len = strlen($str2);
  for($i; $i <= $str2len; $i++ ) {
    if(isset($matched)) {
      $chunk = $matched === 4 ? $chunk + 1 : $chunk + $matched;
    }
    var_dump('chunk',$chunk);
    $substr = substr($str2, $chunk, $str1len);
    if(!$substr) {
      break;
    }
    $lastMatchedKey = $matched = 0;
    $strtoMatchArray = str_split($str1);
    $substrArr = str_split($substr);
        var_dump($substr);
    foreach ($substrArr as $key => $character) {

      if(!in_array($character, $strtoMatchArray) || ($lastMatchedKey && $lastMatchedKey !== $key-1)) {
        $strtoMatchArray = str_split($str1);
        $lastMatchedKey = $matched = 0;
        continue;
      }
      $lastMatchedKey = $key;
      ++$matched;
      unset($strtoMatchArray[array_flip($strtoMatchArray)[$character]]);
        var_dump($matched);
      if($matched === $str1len) {
        var_dump('matches');
        $matches++;
      }

    }
  }
  return $matches;
}

echo appearanceCount(4,13,'cAda','AEAcdacdAcaqt');