- print_r: documentation ( source)
- str_split: documentation ( source)
<?php
$a = [];
$x = 63;
print_r(str_split($x));
die();
for ($x = 0; $x < 10000; $x++) {
// $a[] = substr($x, 0, 1);
// $a[] = substr($x, 1, 1);
$x_arr = str_split($x);
$a[] = $x_arr[0];
$a[] = $x_arr[1];
}
echo count($a);