PHP生成字母表的每2个字符组合。 扭曲：重复允许的字母[关闭]

Question

I believe there is something like 67 million combination of two character strings using only the letters of the alphabet.

I basically want an array in PHP containing something like the following
Array
(
[1] => AA
[2] => AB
[3] => AC
[4] => AD
[5] => AE
[6] => AF
[7] => AG
[8] => AH
[9] => AI
[10] => AJ
.... and so on
)

Answer 1

with two loop you can do this:

<?php 
$arr = array('A', 'B', 'C');
foreach ($arr as $value1) {
    foreach ($arr as $value2) {
        echo $value1.$value2;
    }
}
?>

Then you can put the result in an array.