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What are the challenges of maintaining true randomness in selecting winners in a PHP-based contest when the number of participants is unknown?

When the number of participants is unknown, maintaining true randomness in selecting winners can be challenging because traditional methods like using a random number generator may not be truly random. To address this, one solution is to use a cryptographic secure pseudo-random number generator (CSPRNG) in PHP to ensure a higher level of randomness in selecting winners.

php 
// Using a cryptographic secure pseudo-random number generator (CSPRNG) in PHP
$participants = array("Participant A", "Participant B", "Participant C", "Participant D");

$randomIndex = random_int(0, count($participants) - 1);
$winner = $participants[$randomIndex];

echo "The winner is: " . $winner;

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