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@ 2019-02-16T18:41:11Z

<?php

$characters = ['a', 'b', 'c'];
$string = 'cccc';

$characters = array_flip($characters);
$base = count($characters);
$chrs_to_ords =
    array_map(
        function (string $char) use ($characters) : int {
            return $characters[$char];
        },
        preg_split('//u', $string, -1, \PREG_SPLIT_NO_EMPTY)
    );

$ords =
    implode('', $chrs_to_ords);
    
$baseN =
    base_convert($ords, $base, 10);
    
$length = strlen($baseN);

$next_number =
    str_pad($baseN + 1, $length, '0', \STR_PAD_LEFT);

$next_number =
    base_convert($next_number, 10, $base);
    
$characters = array_flip($characters);

$next_chars = array_map(
    function(int $ord) use ($characters) {
        return $characters[$ord];
    }, 
    str_split($next_number)
);

$next_string = implode('', $next_chars);
var_dump($next_string);

Output for git.master, git.master_jit, rfc.property-hooks: string(5) "baaaa"

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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