(PHP 4 >= 4.0.4, PHP 5, PHP 7)
Hamming distance
int gmp_hamdist ( GMP $a, GMP $b )
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.
Returns:
A GMP number resource in PHP 5.5 and earlier, or a GMP object in PHP 5.6 and later.
Examples:
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:
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