how to replace all Uppercase letters with spacing?

Question

$string = "MaryGoesToSchool";

$expectedoutput = "Mary Goes To School";

Answer 1

Try:

$string = 'MaryGoesToSchool';
$nStr = preg_replace_callback('/[A-Z]/', function($matches){
    return $matches[0] = ' ' . ucfirst($matches[0]);
}, $string);
echo trim($nStr);