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# gmp_hamdist

(PHP 4 >= 4.0.4, PHP 5)

gmp_hamdist -- Hamming distance

## Description

int gmp_hamdist ( resource a, resource b)

Returns the hamming distance between a and b. Both operands should be non-negative.

示範 1.gmp_hamdist() example
`<?php $ham1 = gmp_init("1001010011", 2); $ham2 = gmp_init("1011111100", 2); echo gmp_hamdist($ham1, $ham2) . "\n"; /* hamdist is equivilent to: */ echo gmp_popcount(gmp_xor($ham1, $ham2)) . "\n"; ?>`
The printout of the above program will be:
    6
    6

See also gmp_popcount(), gmp_xor()

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