CRC32

Calculates the crc32 polynomial of a string

The data.

Returns the crc32 checksum of str as an integer.

Warning: Because PHP's integer type is signed many crc32 checksums will result in negative integers on 32bit platforms. On 64bit installations all crc32() results will be positive integers. Use the "%u" formatter of sprintf() or printf() to get the string representation of the unsigned crc32() checksum in decimal format.

PHP