Question

我有一系列'参赛者'，可以这样展示：

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

从这些条目中我需要创建另一个名为$draw的数组。 $draw数组的username重复次数与对应的number_of_entries相同。因此，对于上面的示例，它可能如下所示：

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

我想要这样我以后可以生成一个随机数，并通过$draw[$randomNumber];

之类的方式找到胜利者

但是，我无法理解如何从$draw数组创建$all_entrants数组......我们将非常感谢您的帮助！

Answer 1

我认为你正在寻找这样的东西？

$draw = array();
foreach($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

Answer 2

我认为这是一个关于从一组具有不同重量的名称中选择一个的问题。也许像这样的数组

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

首先计算重量的总和，或者可能已经知道了

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

然后生成一个从0到$ total_weight的随机数，例如。 0℃; = $ rand_number

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

-

顺便说一句，我是新来的，更多要学习：）

Answer 3

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

Answer 4

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

Answer 5

检查一下： -

$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);

输出： -

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

Answer 6

$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);

Answer 7

试试这个

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

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

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

   }



       }

Answer 8

<?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);
?>

希望它有所帮助。

PHP：循环遍历多维PHP数组

8 个答案: