Online PHP editor | output for 4EQ8V

@ 2017-01-29T07:03:55Z

<?php
        //Enter your code here, enjoy!

$s = 6;
$n = 2;
$k = 7;

$z = 0;
$i = 0;
$j = $k;

while ($j <= $s*$n)
{
while ($i <= (($j-$n)/$s))
              {
               
               $fact1 = gmp_fact($n)/(gmp_fact($i)*gmp_fact($n-$i));
               echo $fact1;
               //$fact2 = gmp_fact($j-$s*$i-1,$n-1);
               //$fact2 = gmp_fact($n-$i)/(gmp_fact($j-$s*$i-1)*gmp_fact($n-$i));
               $fact2 = gmp_fact($j-$s*$i-1)/(gmp_fact($n-$i)*gmp_fact($n-$i));
               //echo $fact2;
               $z = $z + pow(-1, $i) * $fact1 * $fact2;
              //$fact1 = gmp_fact(5); // 5 * 4 * 3 * 2 * 1
                //$z = gmp_strval($z);
               $i++;
              }
$j++;
       }
       
//echo pow(gmp_init($z)*(1/$s),$n);

?>

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: 12
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 12
Output for 7.3.32 - 7.3.33, 7.4.33, 8.0.13: Fatal error: Uncaught Error: Call to undefined function gmp_fact() in /in/4EQ8V:17 Stack trace: #0 {main} thrown in /in/4EQ8V on line 17
Process exited with code 255.

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