Best way to list Alphabetical(A-Z) using PHP

Question

I need to print/list alphabetical(A-Z) chararcters to manage Excel cells. Is there any PHP function to list alphabetic?

I need result as

A1
B1
C1
D1
..         


        

Answer 1

$len = 0;
for ($char = 'A'; $char <= 'Z'; $char++) {
    $len++;
    if ($len == 26) {
        break;
    }
    echo $char;
}