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@ 2019-07-30T15:07:14Z

<?php

/**
 * Generate a random string, using a cryptographically secure 
 * pseudorandom number generator (random_int)
 * 
 * For PHP 7, random_int is a PHP core function
 * For PHP 5.x, depends on https://github.com/paragonie/random_compat
 * 
 * @param int $length      How many characters do we want?
 * @param string $keyspace A string of all possible characters
 *                         to select from
 * @return string
 */
function random_str(
    int $length = 64,
    string $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
): string {
    if ($length < 1) {
        throw new \RangeException("Length must be a positive integer");
    }
    $pieces = [];
    $max = mb_strlen($keyspace, '8bit') - 1;
    for ($i = 0; $i < $length; ++$i) {
        $pieces []= $keyspace[random_int(0, $max)];
    }
    return implode('', $pieces);
}

$a = random_str(32);
$b = random_str(8, 'abcdefghijklmnopqrstuvwxyz');
$c = random_str();
var_dump($a, $b, $c);

Output for git.master: string(32) "YhZPeD4pWuzvzh0WhJFDZy1mtc1tGtvd" string(8) "sxmvndbb" string(64) "Qg6VhoCRaX4DOGzfb1fTrJraT0ZHEaa2Hl9i1N3fMiaWdhdtH0NydU59GUqBPvxu"
Output for git.master_jit: string(32) "vEHYn773O8pjVFCbcqYY0powwTsXVdNh" string(8) "gtlftoys" string(64) "GuZHZfU0gvFWCkzexHXzft3luWZiLHnuDVaOTX8qnzE49gbiavHoPELBjz87wosl"

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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