<pre>
<?php
 
$seed = time(); // quite bad choice of seed
 
mt_srand($seed);
echo "Seed: $seed, Random: ".random_bits(512)."\n";
 
mt_srand($seed);
echo "Seed: $seed, Random: ".random_bits(512)."\n";
 
$seed ^= 0x11fedead;
mt_srand($seed);
echo "Seed: $seed, Random: ".random_bits(512)."\n";
 
die;
 
// Counts how many bits are needed to represent $value
function count_bits($value) {
    for($count = 0; $value != 0; $value >>= 1) {
        ++$count;
    }
    return $count;
}
 
// Returns a base16 random string of at least $bits bits
// Actual bits returned will be a multiple of 4 (1 hex digit)
function random_bits($bits) {
    $result = '';
    $accumulated_bits = 0;
    $total_bits = count_bits(mt_getrandmax());
    $usable_bits = intval($total_bits / 8) * 8;
 
    while ($accumulated_bits < $bits) {
        $bits_to_add = min($total_bits - $usable_bits, $bits - $accumulated_bits);
        if ($bits_to_add % 4 != 0) {
            // add bits in whole increments of 4
            $bits_to_add += 4 - $bits_to_add % 4;
        }
 
        // isolate leftmost $bits_to_add from mt_rand() result
        $more_bits = mt_rand() & ((1 << $bits_to_add) - 1);
 
        // format as hex (this will be safe)
        $format_string = '%0'.($bits_to_add / 4).'x';
        $result .= sprintf($format_string, $more_bits);
        $accumulated_bits += $bits_to_add;
    }
 
    return $result;
}
 

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