Php 如何计算字符串中不同的重复字符数

我有一个字符串“Bbcdefcgh！！”，我想计算不同的重复字符。解决方案应将大写和小写字符视为不同的字符，并处理字母中性字符和特殊字符

例如：给定一个字符串“Bbcdefcgh！！”函数应该返回2（'c'和'！'））

---

您可以使用

str\u split

和

array\u count\u value

来处理此问题

$str = 'Bbcdefcgh!!';
$textToArray = str_split($str);
echo '<pre>';
print_r(array_count_values($textToArray));

---

您可以在此处使用一些很酷的功能：

$data = "Two Ts and one F.";

foreach (count_chars($data, 1) as $i => $val)
{
   echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}

Array
(
[B] => 1
[b] => 1
[c] => 2
[d] => 1
[e] => 1
[f] => 1
[g] => 1
[h] => 1
[!] => 2
)

$str = 'Bbcdefcgh!!';
$arr = str_split($str);

$data = array_filter(array_count_values($arr), function($el)
{
    return ($el > 1);
});

echo '<pre>'. print_r($data, 1) .'</pre>';

$data = "Two Ts and one F.";

foreach (count_chars($data, 1) as $i => $val)
{
   echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}