php - 首先使用大写字母按字母顺序对数组进行排序的函数

Question

I'm trying to sort an array alphabetically with uppercase letters first in the array

Example:

array(7) {
  ["H"]=>
  int(1)
  ["W"]=>
  int(1)
  ["e"]=>
  int(1)
  ["l"]=>
  int(3)
  ["o"]=>
  int(2)
  ["r"]=>
  int(1)
  ["d"]=>
  int(1)
}

My code doesn't sort with uppercase letters, only alphabetically

Here is my code:

function count_char($str) {
    $chars = str_split($str);
    $char_counter = Array();
    foreach($chars as $char) 
        if ((ord($char) >= 65 && ord($char) <= 90) || 
            (ord($char) >= 97 && ord($char) <= 122)) {
            if(!isset($char_counter[$char])) $char_counter[$char] = 1;
            else $char_counter[$char] += 1;
        }
    return $char_counter;
}

var_dump(count_char("Hello World"));

My desired output is $str, I would like alphabetizing the uppers, then alphabetizing the lowers

Answer 1

ksort() will do. You should only call ord() once and just store the result to minimize function calls. ...or better just call ctype_alpha() to ensure you are only storing letters. I recommend adding curly brackets for improved readability.

Code: (Demo)

function count_char($str) {
    $chars = str_split($str);
    $char_counter = array();
    foreach($chars as $char) {
        if (ctype_alpha($char)) {
            if (!isset($char_counter[$char])) {
                $char_counter[$char] = 1;
            } else {
                ++$char_counter[$char];
            }
        }
    }
    ksort($char_counter);
    return $char_counter;
}

var_dump(count_char("Hello World"));

Output:

array(7) {
  ["H"]=>
  int(1)
  ["W"]=>
  int(1)
  ["d"]=>
  int(1)
  ["e"]=>
  int(1)
  ["l"]=>
  int(3)
  ["o"]=>
  int(2)
  ["r"]=>
  int(1)
}

---

You could also condense things like this if you aren't scared off by regex:

function count_char($str) {
    $letters = preg_split('~[^a-z]*~i', $str, -1, PREG_SPLIT_NO_EMPTY);
    if (!$letters) return [];
    $counts = array_count_values($letters);
    ksort($counters);
    return $counters;
}

var_dump(count_char("Hello World"));