count the characters in string

$string = "fdkfhkhihrekfbkfndfnnfns";

$chars = str_split($string);

$charCounts = [];

foreach ($chars as $char) {

if (array_key_exists($char, $charCounts)) {

$charCounts[$char]++;

} else {

$charCounts[$char] = 1;

}

}

print_r($charCounts);