Hamming distance

# gmp_hamdist

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_hamdist — Hamming distance

### Description

gmp_hamdist(GMP|int|string `$num1`, GMP|int|string `$num2`): int

Returns the hamming distance between `num1` and `num2`. Both operands should be non-negative.

### Parameters

`num1`

  A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when `base` is equal to 0).

  It should be positive.

`num2`

  A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when `base` is equal to 0).

  It should be positive.

### Return Values

The hamming distance between `num1` and `num2`, as an int.

### Examples

Example #1 gmp_hamdist() example

`<?php
$ham1 = gmp_init("1001010011", 2);
$ham2 = gmp_init("1011111100", 2);
echo gmp_hamdist($ham1, $ham2) . "\n";
/* hamdist is equivalent to: */
echo gmp_popcount(gmp_xor($ham1, $ham2)) . "\n";
?>`

The above example will output:

    6
    6

### See Also

- gmp_popcount() - Population count
- gmp_xor() - Bitwise XOR

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