Working with large numbers in PHP

Question

To use modular exponentiation as you would require when using the Fermat Primality Test with large numbers (100,000+), it calls for some very large calculations.

Whe

Answer 1

$x = 62574 * 62574;

// Cast to an integer
$asInt = intval($x);
var_dump($asInt);
var_dump($asInt % 104659);

// Use use sprintf to convert to integer (%d), which will casts to string
$asIntStr = sprintf('%d', $x);
var_dump($asIntStr);
var_dump($asIntStr % 104659);