PHP Classes

File: src/Search/Bitap/createPatternAlphabet.php

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File: src/Search/Bitap/createPatternAlphabet.php
Role: Auxiliary script
Content type: text/plain
Description: Auxiliary script
Class: Fuse
Fuzzy search of arrays using the Bitap algorithm
Author: By
Last change:
Date: 2 years ago
Size: 316 bytes
 

Contents

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<?php

namespace Fuse\Search\Bitap;

function createPatternAlphabet(string $pattern): array
{
    $mask = [];

    for ($i = 0, $len = mb_strlen($pattern); $i < $len; $i += 1) {
        $char = mb_substr($pattern, $i, 1);
        $mask[$char] = ($mask[$char] ?? 0) | (1 << $len - $i - 1);
    }

    return $mask;
}