復制代碼 代碼如下:

$arr=str_split($str);
$arr=array_count_values($arr);
arsort($arr);
print_r($arr);

復制代碼 代碼如下:

Array
(
[$] => 7
[3] => 6
[*] => 6
[4] => 5
[f] => 5
[s] => 4
[d] => 4
[5] => 3
[a] => 3
[6] => 2
[2] => 2
[g] => 2
[#] => 2
)

復制代碼 代碼如下:

$str="asdfgfdas323344##$/$fdsdfg*$**$*$**$$443563536254fas";//任意長度字符串
$arr=str_split($str);
$unique=array_unique($arr);
foreach ($unique as $a){
$arr2[$a]=substr_count($str, $a);
}
arsort($arr2);
print_r($arr2);