Online PHP editor | rfc for r21LC

@ 2017-07-13T11:44:26Z

<?php

$competitors = [1, 2, 3, 4, 5 , 6, 7, 8];
$rounds = log( count( $competitors ), 2 ) + 1;

// round one
for( $i = 0; $i < log( count( $competitors ), 2 ); $i++ )
{
    $seeded = array( );
    foreach( $competitors as $competitor )
    {
        $splice = pow( 2, $i );

        $seeded = array_merge( $seeded, array_splice( $competitors, 0, $splice ) );
        $seeded = array_merge( $seeded, array_splice( $competitors, -$splice ) );
    }
    $competitors = $seeded;
}

$events = array_chunk( $seeded, 2 );

if( $rounds > 2 )
{
    $round_index = count( $events );

    // second round
    for( $i = 0; $i < count( $competitors ) / 2; $i++ )
    {
        array_push( $events, array(
            array( 'from_event_index' => $i, 'from_event_rank' => 1 ), // rank 1 = winner
            array( 'from_event_index' => ++$i, 'from_event_rank' => 1 )
        ) );
    }

    $round_matchups = array( );
    for( $i = 0; $i < count( $competitors ) / 2; $i++ )
    {
        array_push( $round_matchups, array(
            array( 'from_event_index' => $i, 'from_event_rank' => 2 ), // rank 2 = loser
            array( 'from_event_index' => ++$i, 'from_event_rank' => 2 )
        ) );
    }
    $events = array_merge( $events, $round_matchups );

    for( $i = 0; $i < count( $round_matchups ); $i++ )
    {
        array_push( $events, array(
            array( 'from_event_index' => $i + count( $competitors ) / 2, 'from_event_rank' => 2 ),
            array( 'from_event_index' => $i + count( $competitors ) / 2 + count( $competitors ) / 2 / 2, 'from_event_rank' => 1 )
        ) );
    }
}

if( $rounds > 3 )
{
    // subsequent rounds
    for( $i = 0; $i < $rounds - 3; $i++ )
    {
        $round_events = pow( 2, $rounds - 3 - $i );
        $total_events = count( $events );

        for( $j = 0; $j < $round_events; $j++ )
        {
            array_push( $events, array(
                array( 'from_event_index' => $j + $round_index, 'from_event_rank' => 1 ),
                array( 'from_event_index' => ++$j + $round_index, 'from_event_rank' => 1 )
            ) );
        }

        for( $j = 0; $j < $round_events; $j++ )
        {
            array_push( $events, array(
                array( 'from_event_index' => $j + $round_index + $round_events * 2, 'from_event_rank' => 1 ),
                array( 'from_event_index' => ++$j + $round_index + $round_events * 2, 'from_event_rank' => 1 )
            ) );
        }

        for( $j = 0; $j < $round_events / 2; $j++ )
        {
            array_push( $events, array(
                array( 'from_event_index' => $j + $total_events, 'from_event_rank' => 2 ),
                array( 'from_event_index' => $j + $total_events + $round_events / 2, 'from_event_rank' => 1 )
            ) );
        }

        $round_index = $total_events;
    }

}

if( $rounds > 1 )
{
    // finals
    array_push( $events, array(
        array( 'from_event_index' => count( $events ) - 3, 'from_event_rank' => 1 ),
        array( 'from_event_index' => count( $events ) - 1, 'from_event_rank' => 1 )
     ) );
}

var_dump($events);

Output for git.master, git.master_jit, rfc.property-hooks: array(14) { [0]=> array(2) { [0]=> int(1) [1]=> int(8) } [1]=> array(2) { [0]=> int(4) [1]=> int(5) } [2]=> array(2) { [0]=> int(2) [1]=> int(7) } [3]=> array(2) { [0]=> int(3) [1]=> int(6) } [4]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(0) ["from_event_rank"]=> int(1) } [1]=> array(2) { ["from_event_index"]=> int(1) ["from_event_rank"]=> int(1) } } [5]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(2) ["from_event_rank"]=> int(1) } [1]=> array(2) { ["from_event_index"]=> int(3) ["from_event_rank"]=> int(1) } } [6]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(0) ["from_event_rank"]=> int(2) } [1]=> array(2) { ["from_event_index"]=> int(1) ["from_event_rank"]=> int(2) } } [7]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(2) ["from_event_rank"]=> int(2) } [1]=> array(2) { ["from_event_index"]=> int(3) ["from_event_rank"]=> int(2) } } [8]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(4) ["from_event_rank"]=> int(2) } [1]=> array(2) { ["from_event_index"]=> int(6) ["from_event_rank"]=> int(1) } } [9]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(5) ["from_event_rank"]=> int(2) } [1]=> array(2) { ["from_event_index"]=> int(7) ["from_event_rank"]=> int(1) } } [10]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(4) ["from_event_rank"]=> int(1) } [1]=> array(2) { ["from_event_index"]=> int(5) ["from_event_rank"]=> int(1) } } [11]=> array(2) { [0]=> array(2) { ["from_event_index"]=> float(8) ["from_event_rank"]=> int(1) } [1]=> array(2) { ["from_event_index"]=> float(9) ["from_event_rank"]=> int(1) } } [12]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(10) ["from_event_rank"]=> int(2) } [1]=> array(2) { ["from_event_index"]=> float(11) ["from_event_rank"]=> int(1) } } [13]=> array(2) { [0]=> array(2) { ["from_event_index"]=> int(10) ["from_event_rank"]=> int(1) } [1]=> array(2) { ["from_event_index"]=> int(12) ["from_event_rank"]=> int(1) } } }

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