好玩的线上检测代码工具-codewars(5)

Compare two strings by comparing the sum of their values (ASCII character code).
For comparing treat all letters as UpperCase.

Null-Strings should be treated as if they are empty strings.
If the string contains other characters than letters, treat the whole string as it would be empty.

Examples:

“AD”,”BC” -> equal

“AD”,”DD” -> not equal

“gf”,”FG” -> equal

“zz1”,”” -> equal

“ZzZz”, “ffPFF” -> equal

“kl”, “lz” -> not equal

null, “” -> equal

Your method should return true, if the strings are equal and false if they are not equal.

function compare($s1, $s2) {
  //所有字符全部转化为大写字母
   $s1 = strtoupper($s1);
   $s2 = strtoupper($s2);

   //字符比字母多，视为空字符串

   return formatArr(str_split($s1, 1)) == formatArr(str_split($s2, 1));
}

function formatArr($arr = [])
{
  $new_arr = [];
  $n = 0;
  $asii = 0;

  foreach($arr as $key => $val)
  {
      if(ord($val) <= ord('Z') && ord($val) >= ord('A'))
      {
         $n++;
      }

      $asii += ord($val);
  }

  //字符数大于字母数,视为空字符串
  if(count($arr) > $n)
  {
     return ord('');
  }

  return $asii;
}

class MyTestCases extends TestCase
{
    public function testExample() {
        $this->assertSame(true, compare("AD", "BC"));
    }
}