PHP Echo Random Array and Insert to Database without repeat

Question

I have a code to roll a rand number, and show the winner based on their chance.

    $data = array();
    foreach($getAllUserTicketHistoryJson as $value){
                


        

Answer 1

I'll not be exactly accurate with what you have already asked but give you an alternative approach how to solve the problem. Lets restate the chance first of all as a single entity and rename it ticket. Each ticket has unique and equal chance to be selected in each round.

Lets say you have sold a total of 100 tickets in lottery X. The given lottery is consisted of 5 rounds

$rounds = 1; // starting round
$maxRounds  = 5;
$tickets = range( 1, 100 );

If you need to compare the chances that a player has, holding on a number of tickets it is a different data-set that you should retrieve from your database. That would require an additional table holding this data but it should not "cook" the chance of a ticket to appear. If you need that stat here is an example (in php)

// total of 100 players
$players = range( 1, 100 ); 
$players = array_flip( $players );
 // assign a random number of purchases per player
for( $i = 1; $i <= 100; $players[$i] = mt_rand( 1, 20 ), ++$i );

That would result to a total of

$tickets = range( 1, array_sum( $players ) );

Back to the original problem. You now have a total of sold tickets, and each lottery has 5 rounds. Thus,

$rounds = 1;
$maxRounds  = 5;

while( $rounds <= $maxRounds )
{
    $winners = array_rand( $tickets, 3 );
    $tickets = array_diff( $tickets, $winners );
    shuffle( $winners );

    foreach( $winners as $pos => $winner )
    {
        ++$pos;
        echo "Loterry: {$rounds} - Price {$pos} - winner is {$winner}
";
    }

    ++$rounds;
}

Time to tweak the echo with something you will be able to store in your db in a single go. So I'll rewrite the last part for clarity. NOTE since this is a simple example and is data you control you can add this to your database without filtering it.

$rounds = 1;
$maxRounds  = 5;

$insert = [ ];

while( $rounds <= $maxRounds )
{
    $winners = array_rand( $tickets, 3 );
    $tickets = array_diff( $tickets, $winners );
    shuffle( $winners );

    $insert[$rounds][ ] = $rounds;

    foreach( $winners as $winner )
    {
        $insert[$rounds][ ] = $winner;
    }

    $insert[$rounds] = '(' . implode( ',', $insert[$rounds] ) . ')';

    ++$rounds;
}

$sql    = sprintf( "INSERT INTO `lotteries`( `round`, `first`, `second`, `third` ) VALUES %s;", implode( ', ', $insert ) );

From here on you can use this statement to insert at your db. Just change the table name and the fields to what you actually have in your database. I hope it helped