How to populate a single tournament elimination randomly in PHP without repeat?

Question

If i have this:

$players = array("A","B","C","D","E","F","G","H","I","J","L","M","N","O","P","Q");

How i populate a single tournament elimination like this for example:

Matche 1: AxL
Matche 2: CxJ
Matche 3: HxQ
.
.
.
Matche 8: ExP

16 players = 8 Matches

I try this and other codes too:

<?php

$players = array("A","B","C","D","E","F","G","H","I","J","L","M","N","O","P","Q");
shuffle ($players);

foreach($players as $key=>$value)
{
    echo $value.','.$value.'<br>';
}

?>

This isn't a code writing service, but if you try writing something you'll probably find some help here. — BigScar, Jun 17 '15 at 15:43
[shuffle](http://www.php.net/shuffle) the players array and just assign them 0x1,2x3... — Jonathan Kuhn, Jun 17 '15 at 15:44

score 6 · Accepted Answer · edited Jun 17 '15 at 16:05

6

This should work for you:

Just shuffle() your array and then array_chunk() it into groups of 2, e.g.

<?php

    $players = ["A","B","C","D","E","F","G","H","I","J","L","M","N","O","P","Q"];
    shuffle($players);
    $players = array_chunk($players, 2);

    foreach($players as $match => $player)
        echo "Match " . ($match+1) . ": " . $player[0] . "x" . $player[1] . "<br>";

?>

edited Jun 17 '15 at 16:05

Funk Forty Niner

74,450
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answered Jun 17 '15 at 16:03

Rizier123

58,877
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how to use with: array(8) { [0]=> object(stdClass)#4 (2) { ["idPlayer"]=> string(1) "7" ["namePlayer"]=> string(8) "Player 3" } [1]=> object(stdClass)#5 (2) } – Do Xuan Nguyen Jun 22 '16 at 09:48
@DoXuanNguyen And what would be the expected output? – Rizier123 Jun 22 '16 at 13:05

score 2 · Answer 2 · answered Jun 17 '15 at 16:01

2

Use the suffle function to randomize the order of the players and read the array by steps of 2

shuffle($players);

for ($x = 0; $x < count($players); $x += 2) {
  echo "Match " . (($x/2)+1) . ": " . $players[$x] . "x" . $players[$x+1] . "\n";
}

answered Jun 17 '15 at 16:01

PerroVerd

945
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How to populate a single tournament elimination randomly in PHP without repeat?

2 Answers2