Question

我想在关联数组中插入两个值，一个用于键，第二个用于值，因为我打印该数组时，它应包含所有a-k作为键，0-10作为其对应值。

<?php
$z=array("a","b","c","d","e","f","g","h","i","j","k");

$countsub1 = array();
for($i=0;$i<=10;$i++)
{

$countsub1 = array("$z[$i]","$i");

}
print_r($countsub1);

?>

在这里，我只得到数组中变量的最后一个值，但我希望所有变量都在一个中。如何做到这一点??

我想要输出

数组（[a] =＆gt; 0，[b] =＆gt; 1，[c] =＆gt; 2，[d] =＆gt; 3，[e] =＆gt; 4，[f] =＆gt; ; 5 ..........等等）

Answer 1

在一行中，您可以使用 array_flip() PHP函数。

$countsub1 = array_flip($z);

OR

$z=array("a","b","c","d","e","f","g","h","i","j","k");    
$countsub1 = array();
for($i=0;$i<=10;$i++)
{
   $countsub1[$z[$i]] = $i;
}
print_r($countsub1);

<强>输出

Array
(
    [a] => 0
    [b] => 1
    [c] => 2
    [d] => 3
    [e] => 4
    [f] => 5
    [g] => 6
    [h] => 7
    [i] => 8
    [j] => 9
    [k] => 10
)

Answer 2

您没有将其存储到array。您将其存储到variable。这就是为什么它覆盖了最后一个值而你正在获得最后一个值。试试 -

$countsub1[] = array("$z[$i]","$i");

Answer 3

试试这个：

<?php
$z=array("a","b","c","d","e","f","g","h","i","j","k");

$countsub1 = array();
for($i=0;$i<=10;$i++) {
    $countsub1[] = array($z[$i],$i);
}
print_r($countsub1);
?>

您必须将赋值给$countsub1[]的数组，因为$countsub1将覆盖每个循环上的前一个值。

PS：变量不应该像分配时一样放在引号内，PHP可能会将其视为字符串

Answer 4

您继续覆盖$countsub1，这就是您只获得最后一个值的原因。

您需要使用以下方法之一将其附加到数组中：

$countsub1[] = array("$z[$i]","$i"); 
array_push($countsub1, array("$z[$i]","$i"));

Answer 5

制作像OP这样的关联数组的答案是：如果您想要重复密钥，下面的代码将起作用，如果不是，我建议进行数组合并

$z=array("a","b","c","d","e","f","g","h","i","j","k");

$countsub1 = array();
for($i=0;$i<=10;$i++)
{
   //duplicate keys option
   $countsub1[] = array($z[$i] => $i);
    //single array with unique keys
   $countsub1 = array_merge($countsub1, array($z[$i] => $i));
}
print_r($countsub1);

Answer 6

试试这个：

 $arr=array();
    for($i=0; $i<=10; $i++){
        $key =$z[i];
        $arr[$key]=$i;
    }

Answer 7

像其他人说的那样，你继续分配给$countsub1，所以它被覆盖并具有最后一个赋值的值。您需要追加代替。

所以你要做的是翻转$z数组的键和值，对吧？如果是这样，那么您已经有了预定义的功能：array_flip

编辑：如果你想手动完成，我建议下面更灵活的代码，接受不同长度的$z：

$countsub1 = array();
foreach ($z as $key => $value) {
    $counsub1[$value] = $key;
}

Answer 8

在您的代码中，如果要将值插入数组，则将值分配给变量hens，它将获取最后一个值

 $array=array()
    for($i=0;$i<=10;$i++)
    {

    $array[] = array($z[$i],$i);

    }

    print_r($array)

$array[] is the method to insert values into the array.and $array  is the method to assign value to variable . 
that's the reason you are getting only last value as it is overwriting the previous value.

$array[] will store the values into the index like "0,1,2....."
$array will override the values every time in the loop
if you use $array['key'] in the loop it will also do the same job as $array

如何使用for循环在关联数组中插入变量

8 个答案: