gmp_hamdist
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_hamdist — Hamming distance
Description
Returns the hamming distance between a and
b. Both operands should be non-negative.
Parameters
-
a -
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
It should be positive.
-
b -
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
It should be positive.
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
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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