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.
例子 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";
?>
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The printout of the above program will be:
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See also gmp_popcount(),
gmp_xor()