How to make the second character uppercase?

Question

I work with Apple Product Name a lot

"iphone"
"ipad"
"imac"

What would be the quickest way to make the second character uppercase?

"iPhone"
"iPad"
"iMac"

---

I tried

// $name = iphone
if ($name[0] == 'i') {
    strtoupper($name[1]);
    dd($name); //iphone
}

Answer 1

Perfect answer

 $word ='iphone';
 $result = str_replace(substr($word,1,1),ucfirst(substr($word,1,1)),$word);
 echo $result;

Answer 2

You have to replace the value in original variable:

$name[1] = strtoupper($name[1]);