PHP determines uppercase and lowercase letters function

Provide a simple example of PHP function to determine uppercase and lowercase letters. It can find out how many uppercase letters and lowercase letters a string has. It is a very convenient and commonly used function. The code is as follows:

function checkcase($str){ _ If (preg_match ('/^[a-z]+$/', $ str)) {

echo 'lowercase letter'; ; ;

function checkcase1($str){

$str = ord($str);

if($str>64&&$str<91 ){

echo 'capital letters';

return;

}

If($str>96&&$str< )

if(strtoupper($str)=== $str){

                                                                                                    echo 'uppercase letters';                                                                                                                                                                     worse worse worse — not more less than uppercase letters";

echo checkcase2($str);

//Open source software: phpfensi.com

?>