php - 首先使用大写字母按字母顺序对数组进行排序的函数

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

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"));

Personally I would do it like:

<?php
$str = "Hello World";

// split the string (ignoring spaces)
$array = str_split(str_replace(' ', '', $str), 1);

// count the chars
$array = array_count_values($array);

// sort naturally
array_multisort(array_keys($array), SORT_NATURAL, $array);

print_r($array);

https://3v4l.org/aZqRb

Result:

Array
(
    [H] => 1
    [W] => 1
    [d] => 1
    [e] => 1
    [l] => 3
    [o] => 2
    [r] => 1
)

Edit: If you want to sort by value and then by key:

<?php
$str = "Hello World";

// split the string (ignoring spaces)
$array = str_split(str_replace(' ', '', $str), 1);

// count the chars
$array = array_count_values($array);

// get the keys
$keys = array_keys($array);

// sort my keys
array_multisort($array, $keys);

// combine sorted keys with array
$array = array_combine($keys, $array);

print_r($array);

https://3v4l.org/pfEin

Result:

Array
(
    [H] => 1
    [W] => 1
    [d] => 1
    [e] => 1
    [r] => 1
    [o] => 2
    [l] => 3
)