PHP读取文本文件并逐行输出该行使用最多的字符

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$myfile = fopen("test.txt", "r");
while(!feof($myfile)) {
  $line_str = fgets($myfile);
  $str_arr = count_chars($line_str, 1);
  arsort($str_arr);
  print_r(chr(key($str_arr)).' is '.current($str_arr).PHP_EOL);
}
fclose($myfile);

 e is 5 w is 3 p is 4