test.php

<?php
$r = [
    '' => '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz',
    1 => 0, 1, 2, 3, 4, 5, 6, 7, 8, 'A' => 9,
    'B' => 10, 'C' => 11, 'D' => 12, 'E' => 13, 'F' => 14, 'G' => 15,
    'H' => 16, 'J' => 17, 'K' => 18, 'L' => 19, 'M' => 20, 'N' => 21,
    'P' => 22, 'Q' => 23, 'R' => 24, 'S' => 25, 'T' => 26, 'U' => 27,
    'V' => 28, 'W' => 29, 'X' => 30, 'Y' => 31, 'Z' => 32, 'a' => 33,
    'b' => 34, 'c' => 35, 'd' => 36, 'e' => 37, 'f' => 38, 'g' => 39,
    'h' => 40, 'i' => 41, 'j' => 42, 'k' => 43, 'm' => 44, 'n' => 45,
    'o' => 46, 'p' => 47, 'q' => 48, 'r' => 49, 's' => 50, 't' => 51,
    'u' => 52, 'v' => 53, 'w' => 54, 'x' => 55, 'y' => 56, 'z' => 57,
];

echo json_encode($r, JSON_PRETTY_PRINT);

echo PHP_EOL;