PHP: Loop through a multidimesional PHP array

Question

I've got an array of 'contestant entrants' which can be shown like this:

 $all_entrants = array(
    array('username'=>'122', 'number_of_entries'=>1),
    array('username'=>'123', 'number_of_entries'=>4),
    array('username'=>'124', 'number_of_entries'=>3),
    ...
 )

From these entries I need to create another array called $draw. The $draw array will have username repeated as many times as it's corresponding number_of_entries. So for the above example it might look like this:

 $draw = array("122", "123", "123", "123", "123", "124", "124", "124")

I want this so that I can later generate a random number, and find the winner by doing something like $draw[$randomNumber];

However I cannot get my head around how to create that $draw array from the $all_entrants array... Any help will be greatly appreciated!

Darvex · Accepted Answer · 2013-09-12 09:53:22Z

5

I assume you're looking for something like this?

$draw = array();
foreach($all_entrants as $entrant) // loop through array with entrants
     for ($i = 0; $i<$entrant['number_of_entries']; $i++) //get number of entries
       $draw[] = $entrant['username']; //add them to the $draw array

edited Sep 12, 2013 at 9:53

answered Sep 12, 2013 at 9:47

Darvex

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2 Comments

Darvex Over a year ago

@BenFortune you are correct, thank you, will fix it right away!

Allen S Over a year ago

Thank you! Tried it and it's exactly what I need! Will mark as correct in a few mins.

chai · Accepted Answer · 2013-09-12 10:18:43Z

2

I think it's a question about select one from a group of name which has different weight. maybe an array like this

$group = array(
    array('122' => 1),
    array('123'=> 4),
    array('124'=> 3) 
);

First Calculate the sum of the weight, or may be it has been known already

$total_weight = 0;
foreach($group as $weight){
    $total_weight += $weight;
}

Then generate a random number from 0 to $total_weight, eg. 0<=$rand_number

$current_total = 0;
foreach($group as $name => $weight){
    if($rand_number <= $current_total)
        return $name;
    $current_total += $weight;
}

--

BTW, I'm new here, more to learn:)

answered Sep 12, 2013 at 10:18

chai

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Comments

ChrJantz · Accepted Answer · 2013-09-12 09:48:28Z

1

<?php
$draw = array();
foreach($all_entrants as $entrant) {
    for($i=0; $i<$entrant['number_of_entries']; $i++) {
        $draw[] = $entrant['username'];
    }
}

answered Sep 12, 2013 at 9:48

ChrJantz

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Comments

William Buttlicker · Accepted Answer · 2013-09-12 09:50:01Z

1

$draw = array();
foreach($all_entrants as $entrant) {
    for($i=0; $i<$entrant['number_of_entries']; $i++) {
        $draw[] = $entrant['username'];
    }
}

answered Sep 12, 2013 at 9:50

William Buttlicker

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Comments

Rajeev Ranjan · Accepted Answer · 2013-09-12 11:29:30Z

1

$all_entrants = array(
    array('username'=>'122', 'number_of_entries'=>1),
    array('username'=>'123', 'number_of_entries'=>4),
    array('username'=>'124', 'number_of_entries'=>3),
);
$draw = array();
foreach($all_entrants as $entrant) {
    $draw = array_merge(
                      $draw,
                      array_fill(0, $entrant['number_of_entries'], $entrant['username'])
                       );
}
var_dump($draw);

edited Sep 12, 2013 at 11:29

Rajeev Ranjan

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answered Sep 12, 2013 at 10:03

Mark Baker

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1 Comment

Rajeev Ranjan Over a year ago

best answer among all these answer.

nickle · Accepted Answer · 2013-09-12 09:50:19Z

0

Try this

$newarray=array();
foreach($all_entrants as $list){

for($i=1;$i<=$list['number_of_entries'];$i++){

  array_push($newarray,$list['username']);

   }



       }

answered Sep 12, 2013 at 9:50

nickle

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Comments

Leysam Rosario · Accepted Answer · 2013-09-12 09:52:06Z

0

<?php 
$all_entrants = array(
    array('username'=>'122', 'number_of_entries'=>1),
    array('username'=>'123', 'number_of_entries'=>4),
    array('username'=>'124', 'number_of_entries'=>3)
 );

$draw = array();

for ($i = 0; $i < count($all_entrants); $i++) 
{
    $entrants = $all_entrants[$i];
    $name = $entrants["username"];
    $entry_count = $entrants["number_of_entries"];
    for ($j = 0; $j < $entry_count; $j++) $draw[] = $name;
}

print_r($draw);
?>

Hope it helps.

answered Sep 12, 2013 at 9:52

Leysam Rosario

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Comments

Rajeev Ranjan · Accepted Answer · 2013-09-12 09:53:43Z

0

check this :--

$result=array();
$all_entrants = array(
    array('username'=>'122', 'number_of_entries'=>1),
    array('username'=>'123', 'number_of_entries'=>4),
    array('username'=>'124', 'number_of_entries'=>3)

 );
foreach($all_entrants as $value)
   for($i=0;$i<$value['number_of_entries'];$i++)
       array_push($result,$value['username']);
echo '<pre>';
print_r($result);

output :-

Array
(
    [0] => 122
    [1] => 123
    [2] => 123
    [3] => 123
    [4] => 123
    [5] => 124
    [6] => 124
    [7] => 124
)

answered Sep 12, 2013 at 9:53

Rajeev Ranjan

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