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crc32
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crc32

Name

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

Synopsis

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

Returns

Signed integer CRC

Description

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

Note

For more information on CRCs, visit http://www.foldoc.org/ and search forCRC. Many entry-level computer science texts also contain information on CRCs.

Version

PHP 4.0.1+

Example

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

<?php
$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'";
?>

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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 http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ 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.