<?php
 
function punyaHuruf(string $kataPertama, string $kataKedua): bool
{
  $hurufPertama = str_split(strtolower($kataPertama));
  $hurufKedua = str_split(strtolower($kataKedua));
 
  foreach ($hurufPertama as $huruf) {
    $index = array_search($huruf, $hurufKedua);
    if ($index === false) {
      return false;
    }
    unset($hurufKedua[$index]);
  }
 
  return true;
}
 
var_dump(punyaHuruf('cat', 'antartica'));
var_dump(punyaHuruf('cat', 'australia'));
var_dump(punyaHuruf('attract', 'ANTARTICA'));

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