$alphabet = 'abcd';
$length = 5;
$words = array();
function makeword($prefix)
{
global $alphabet, $length, $words;
if (strlen($prefix) == $length)
{
$words[] = $prefix;
return;
}
for ($i = 0; $i < strlen($alphabet); $i++)
makeword($prefix . $alphabet{$i});
}
makeword('');
// Все слова - в массиве $words
echo count($words);
<?php
$text_lenght = 3;
$charset = '01';
$charset_length = strlen($charset);
function recurse($width, $position, $base_string)
{
global $text_lenght, $charset, $charset_length;
for ($i = 0; $i < $charset_length; ++$i) {
if ($position < $width - 1) {
recurse($width, $position + 1, $base_string . $charset[$i]);
}
if (strlen($base_string . $charset[$i]) == $text_lenght) {
echo $base_string . $charset[$i].'
';
}
}
}
recurse($text_lenght, 0, '');
?>
<?php
function brut36($A="0123456789", $N=1)
{
$base="0123456789abcdefghijklmnopqrstuvwxyz";
$b=strlen($A);
$count=pow($b, $N);
for ($i=0;$i<$count;$i++)
echo strtr(str_pad(base_convert($i, 10, $b), $N, "0",
STR_PAD_LEFT), $base, $A),"\r\n";
}
brut36("01", 3);000
001
010
011
100
101
110
111
Простой