What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.



crc32 — Calculates a 32-bit CRC for a string.


int crc(string);
string string: String for which to calculate the crc32 polynomial


Signed integer CRC


crc32() generates a 32-bit cyclic redundancy code (CRC) for a string.


For more information on CRCs, visit and search forCRC. Many entry-level computer science texts also contain information on CRCs.


PHP 4.0.1+


Example 1197. Generate a 32-bit CRC for the contents of a file

$file = __FILE__;

// Read the file into an array
$data = file($file);

// Join the array into a string
$data = implode('', $data);

// Calculate the crc
$crc = crc32($data);

echo "The CRC for file '$file' is '$crc'";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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