- chr: documentation ( source)
- mt_rand: documentation ( source)
- mt_srand: documentation ( source)
- str_replace: documentation ( source)
- base64_encode: documentation ( source)
<?php
mt_srand(42);
for ($i = 0; $i < 20; $i++) {
$key = generate_key();
$len = count($key);
echo "{$key} {$len}\n";
}
function generate_key() {
return base64_urlencode(rand_buffer(48));
}
function base64_urlencode($buf) {
return str_replace(array('+', '/', '='), array('-', '_', ''), base64_encode($buf));
}
function rand_buffer($n) {
// return openssl_random_pseudo_bytes($n);
$buf = "";
for ($i = 0; $i < $n; $i++) {
$buf .= chr(mt_rand(0, 255));
}
return $buf;
}