Stuck on day 5.

2015/days/day5.php

@@ -0,0 +1,78 @@
+<?php
+/**
+* It contains at least three vowels (aeiou only), like aei, xazegov, or aeiouaeiouaeiou.
+* It contains at least one letter that appears twice in a row, like xx, abcdde (dd), or aabbccdd (aa, bb, cc, or dd).
+* It does not contain the strings ab, cd, pq, or xy, even if they are part of one of the other requirements.
+*/
+
+
+// What do i need to do for each string?
+// Count vowels, check if there are >=3
+// Count unique chars, ensure one char appears twice
+// Check for a certain set of strings to omit.
+
+function checkNice(string $string): bool {
+  preg_match_all('/[aeiou]/i', $string, $vowels);
+  if (count($vowels[0]) < 3) {
+    return FALSE;
+  }
+  if (!preg_match('/(.)\1/', $string, $match)){
+    return FALSE;
+  }
+  $omit_strings = [
+    'ab',
+    'cd',
+    'pq',
+    'xy',
+  ];
+  foreach ($omit_strings as $omit) {
+    if (str_contains($string, $omit))  {
+      return FALSE;
+    }
+  }
+
+  return TRUE;
+}
+
+function checkNice2(string $string): bool {
+  $two_char_sets = str_split($string, 2);
+  $str_to_arr = str_split($string);
+  $counts = array_count_values($two_char_sets);
+  $is_nice = FALSE;
+  foreach ($counts as $substr => $count) {
+    if ($count >= 2) {
+      $is_nice = TRUE;
+      preg_match_all('/(.)(.)\1/', $string, $matches); 
+      if (count($matches[0]) > 1) {
+        $is_nice = TRUE;
+      }
+      else {
+        $is_nice = FALSE;
+      }
+    }
+  }
+
+  return $is_nice;
+}
+
+function day5($part = 1) {
+  $file = new SplFileObject("./2015/inputs/day5.txt");
+  // Loop until we reach the end of the file.
+  $nice_strings = 0;
+  while (!$file->eof()) {
+    // Echo one line from the file.
+    if ($part == 1) {
+      $is_nice = checkNice($file->fgets());
+    }
+    elseif ($part == 2) {
+      $is_nice = checkNice2($file->fgets());
+    }
+    if ($is_nice) {
+      $nice_strings++;
+    }
+  }
+  // Unset the file to call __destruct(), closing the file handle.
+  $file = null;
+
+  return $nice_strings;
+}