PHP Functions Essential Reference

crc32

int crc(string string) 

Calculates a 32-bit CRC for a string.

Returns:

Signed integer CRC

Description:

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

Note:

For more information on CRCs, visit www.foldoc.org and search for CRC. Many entry-level computer science texts also contain information on CRCs.

Version:

PHP 4.0.1+

Example:

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'"; ?>