PHP code example of buexplain / bitmap

1. Go to this page and download the library: Download buexplain/bitmap library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

buexplain / bitmap example snippets




itMap\ClientFactory;
$b1 = ClientFactory::make();
$b2 = ClientFactory::make();

//求并集，并将结果保存到$b1
$b1->addMany([1, 2]);
$b2->addMany([2, 3]);
$b1->or($b2);
print_r($b1->toArray()); //[1,2,3]

//求交集，并将结果保存到$b1
$b1->clear()->addMany([1, 2, 3]);
$b2->clear()->addMany([2, 3, 4]);
$b1->and($b2);
print_r($b1->toArray()); //[2,3]

//求差集，并将结果保存到$b1
$b1->clear()->addMany([1, 2, 3]);
$b2->clear()->addMany([1, 3, 4]);
$b1->andNot($b2);
print_r($b1->toArray()); //[2]

//求对称差集，并将结果保存到$b1
$b1->clear()->addMany([1, 2, 3]);
$b2->clear()->addMany([3, 4, 5]);
$b1->xOr($b2);
print_r($b1->toArray()); //[1,2,4,5]

//迭代，每次从$b1中弹出2个元素，所有迭代完成后，$b1中的元素个数是0
$b1->clear()->addMany([1, 2, 3, 4, 5, 200000000, 6, 20, 200000001]);
while ($tmp = $b1->iterate(2)) {
    print_r($tmp); // [1,2], [3,4], [5,6], [20,200000000], [200000001]
}
var_dump($b1->getCardinality() == 0); //true