/**
* Tests $num on primality. Returns true, if $num is strong pseudoprime.
* Else returns false.
*
* @param string $num
* @return bool
* @access private
*/
function isPrime($num)
{
return bi_is_prime($num) ? true : false;
}
*/ $c = bi_pow($a, 4); echo 'pow($a, 4) = [', bi_to_str($c), "]<br/>\n"; // argument of bi_fact() must have integer type (not BIG_INT) $c = bi_fact(100); echo '100! = [', bi_to_str($c), "]<br/>\n"; $c = bi_sqrt($a); echo 'sqrt($a) = [', bi_to_str($c), "]<br/>\n"; $c = bi_sqrt_rem($a); echo 'sqrt_rem($a) = [', bi_to_str($c), "]<br/>\n"; $c = bi_gcd($a, $b); echo 'GCD($a, $b) = [', bi_to_str($c), "]<br/>\n"; // Miller-Rabin primality test of $a echo 'miller_test($a, $b) = ', bi_miller_test($a, $b), "<br/>\n"; // primality test of $a echo 'is_prime($a) = ', bi_is_prime($a), "<br/>\n"; // Jacobi symbol ($a|$b) echo 'jacobi($a, $b) = ', bi_jacobi($a, $b), "<br/>\n"; $c = bi_div_extended($a, $b); echo '$a = $b * ', bi_to_str($c[0]), ' + ', bi_to_str($c[1]), "<br/>\n"; $c = bi_gcd_extended($a, $b); echo 'abs($a) * ', bi_to_str($c[1]), ' + abs($b) * ', bi_to_str($c[2]), ' = ', bi_to_str($c[0]), "<br/>\n"; // serialize $a into sequence of bytes $str = bi_serialize($a); echo '$str = serialize($a) = [', base64_encode($str), "]<br/>\n"; // unserialize $a from sequence of bytes $a = bi_unserialize($str); echo 'unserialize($str) = [', bi_to_str($a), "]<br/>\n"; // show package info var_dump(bi_info()); echo 'the list of all functions in BIG_INT module:', "<br/>\n";