How can full-text search functionality be implemented in PHP for indexing HTML pages?

To implement full-text search functionality in PHP for indexing HTML pages, you can use a combination of PHP's file handling functions, regular expressions, and a search algorithm like the Levenshtein distance algorithm to determine relevancy of search results. 

<?php
// Function to index HTML pages for full-text search
function indexHTMLPages($directory){
    $index = array();

    $files = glob($directory . '/*.html');
    foreach($files as $file){
        $content = file_get_contents($file);
        $text = strip_tags($content); // Strip HTML tags
        $words = preg_split('/\s+/', $text); // Split text into words

        foreach($words as $word){
            $word = strtolower($word);
            if(strlen($word) > 3){ // Ignore short words
                if(!isset($index[$word])){
                    $index[$word] = array();
                }
                $index[$word][] = $file;
            }
        }
    }

    return $index;
}

// Function to search indexed HTML pages
function searchHTMLPages($index, $query){
    $results = array();
    $query = strtolower($query);
    $queryWords = preg_split('/\s+/', $query);

    foreach($queryWords as $word){
        if(isset($index[$word])){
            $results = array_merge($results, $index[$word]);
        }
    }

    $results = array_unique($results);

    return $results;
}

// Index HTML pages in a directory
$index = indexHTMLPages('path/to/html/pages');

// Search indexed HTML pages for a query
$searchResults = searchHTMLPages($index, 'search query');

print_r($searchResults);
?>

Keywords

full-text search PHP indexing HTML pages implementation

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