Online PHP editor | output for jXd3E

@ 2018-01-22T11:02:24Z

<?php

function greatest_prime($n)
{
    for($x1 = (int)floor(sqrt($n)); $x1 > 3; $x1--)
    {
        if($n % $x1 != 0)
            continue;
        $x2 = $n/$x1;
        if(is_prime($x1))
            return $x1;
        if(is_prime($x2))
            return $x2;
    }
}
function is_prime($x)
{
    for($y = (int)floor(sqrt($x)); $y > 1; $y--)
        if($x % $y == 0)
            return false;
    return true;
}
var_dump(greatest_prime(600851475143));

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 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: int(6857)
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 int(6857)

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