Например, это мой текст:
$str = 'buy new microsoft windows';
Я взорву текст и список с массивом:
Array
(
[0] => buy
[1] => new
[2] => microsoft
[3] => windows
)
Я хочу генерировать слова в массиве примерно так:
buy new
buy new windows
buy microsoft
buy microsoft windows
buy windows
new microsoft
new microsoft windows
new windows
microsoft windows
Я пробовал с foreach и rand, но я не мог сгенерировать, как показано. Есть ли возможность генерировать, как и мой запрос?
Вы можете посмотреть этот PEAR PACKAGE Пример использования:
<?php
require_once 'Math/Combinatorics.php';
$words = array('buy', 'new', 'microsoft');
$combinatorics = new Math_Combinatorics;
foreach($combinatorics->permutations($words, 2) as $p) {
echo join(' ', $p), "\n";
}
Выход будет:
buy new
new buy
buy microsoft
microsoft buy
new microsoft
microsoft new
shuffle($array);
echo join(' ', array_slice($array, 0, mt_rand(1, count($array))));
Это дает вам одно случайное "предложение". При необходимости повторите.
function pc_permute($items, $perms = array( )) {
if (empty($items)) {
print join(' ', $perms) . "\n";
} else {
for ($i = count($items) - 1; $i >= 0; --$i) {
$newitems = $items;
$newperms = $perms;
list($foo) = array_splice($newitems, $i, 1);
array_unshift($newperms, $foo);
pc_permute($newitems, $newperms);
}
}
}
источник: http://docstore.mik.ua/orelly/webprog/pcook/ch04_26.htm#phpckbk-CHP-4-EX-6
также проверьте следующий пример на этом сайте
пример: pc_permute( explode( ' ', 'buy new microsoft windows' ) );
buy new microsoft windows new buy microsoft windows buy microsoft new windows microsoft buy new windows new microsoft buy windows microsoft new buy windows buy new windows microsoft new buy windows microsoft buy windows new microsoft windows buy new microsoft new windows buy microsoft windows new buy microsoft buy microsoft windows new microsoft buy windows new buy windows microsoft new windows buy microsoft new microsoft windows buy new windows microsoft buy new new microsoft windows buy microsoft new windows buy new windows microsoft buy windows new microsoft buy microsoft windows new buy windows microsoft new buy
Найдено из php.net shuffle doc
function powerSet($in,$minLength = 1) {
$count = count($in);
$members = pow(2,$count);
$return = array();
for ($i = 0; $i < $members; $i++) {
$b = sprintf("%0".$count."b",$i);
$out = array();
for ($j = 0; $j < $count; $j++) {
if ($b{$j} == '1') $out[] = $in[$j];
}
$out_val = implode(" ", $out);
if (count($out) >= $minLength) {
$return[] = $out_val;
}
}
return $return;
}
print_r(powerSet($str_arr));
и результаты будут,
Array
(
[0] => windows
[1] => microsoft
[2] => microsoft windows
[3] => new
[4] => new windows
[5] => new microsoft
[6] => new microsoft windows
[7] => buy
[8] => buy windows
[9] => buy microsoft
[10] => buy microsoft windows
[11] => buy new
[12] => buy new windows
[13] => buy new microsoft
[14] => buy new microsoft windows
)
Для всех возможных комбинаций я улучшил @SujitAgarwal Ответ:
Загрузите Math_Combinatoeics.
include_once 'Combinatorics.php';
$words = array('buy','microsoft','windows');
$count = count($words);
$return = array();
$combinatorics = new Math_Combinatorics;
for ($num=1; $num <= $count; $num++ ){
foreach($combinatorics->permutations($words, $num) as $p) {
$return[] = join(' ', $p);
}
}
print_r($return);
Выход:
Array
(
[0] => buy
[1] => microsoft
[2] => windows
[3] => buy microsoft
[4] => microsoft buy
[5] => buy windows
[6] => windows buy
[7] => microsoft windows
[8] => windows microsoft
[9] => buy microsoft windows
[10] => buy windows microsoft
[11] => microsoft windows buy
[12] => microsoft buy windows
[13] => windows buy microsoft
[14] => windows microsoft buy
)