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.

Parameters

a

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

It should be positive.

b

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

It should be positive.

Return Values

A GMP number resource.

Examples

Example #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 above example will output:

6
6

See Also

  • gmp_popcount
  • gmp_xor