How do search engines like Google index and search PDF files, and what strategies can be adapted for implementing a similar functionality in a PHP-based search function on a web server?

To index and search PDF files, search engines like Google typically use text extraction techniques to parse the content of the PDF files and make it searchable. To implement a similar functionality in a PHP-based search function on a web server, you can use libraries like "pdftotext" or "PDFParser" to extract text from PDF files and then index and search the extracted text. 

// Include the PDFParser library
require_once('PDFParser.php');

// Create a new instance of PDFParser
$pdfParser = new PDFParser();

// Parse the PDF file and extract text
$text = $pdfParser->parse('example.pdf');

// Index the extracted text for searching
$indexedText = strtolower($text); // Convert text to lowercase for case-insensitive search

// Implement search functionality
$searchTerm = 'keyword';
if (strpos($indexedText, strtolower($searchTerm)) !== false) {
    echo 'Search term found in PDF file.';
} else {
    echo 'Search term not found in PDF file.';
}

Keywords

PDF indexing search engine Google PHP search function web server

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