Question

我的目标：创建像

这样的动态变量

$counterMon00 = 0;
$counterMon01 = 0;
$counterThu23 = 0;

我的代码到现在为止：

$array_days = ["Mon","Tue","Wed","Thu","Fri"];
for ($i = 0; $i < sizeof($array_days); $i++)
{
   $weekDay = (String) $array_days[$i];
   for($ii = 7; $ii < 10; $ii++)
   {
   "counter".${$weekDay}.${$ii} = 0;
   }
}

你能用这条线帮助我吗

"counter".${$weekDay}.${$ii} = 0;

我尝试了不同的解决方案，但没有任何效果......

Answer 1

在使用之前，您需要将变量设置为单个字符串。

$var = "counter".$weekDay.$ii;
$$var = 0;

Answer 2

${"counter".$weekDay.$ii} = 0;

Answer 3

尝试使用variable variables：

$varName = "counter".${$weekDay}.${$ii};
$$varName = 0;//Note the $$

你也可能想要建立一个数组而不是上面的数据，因为这会更容易（至少在我看来）。类似于工作日的数组映射计数，即

$arr["Mon"][3] = 0;

Answer 4

$array_days = array("Mon","Tue","Wed","Thu","Fri");
for ($i = 0; $i < count($array_days); $i++)
{
   $weekDay = (String) $array_days[$i];
   for($ii = 7; $ii < 10; $ii++)
   {
   $var="counter".$weekDay.$ii;
   $$var;
   }

}

Answer 5

你想要一个数组！这正是他们的目的所在。在99％的情况下，变量变量都是个坏主意。

$counter = [];
$days    = ["Mon","Tue","Wed","Thu","Fri"];

foreach ($days as $day) {
    foreach (range(7, 9) as $i) {
        $counter[$day][$i] = 0;
    }
}

Answer 6

请在数组声明中尝试以下错误

<?php
$array_days = array("Mon","Tue","Wed","Thu","Fri");
for ($i = 0; $i < sizeof($array_days); $i++)
{
  $weekDay = (String) $array_days[$i];
   for($ii = 7; $ii < 10; $ii++)
   {
    $var = "counter".$weekDay.(String)$ii;
    $$var = 0;
   }
}
?>

Answer 7

试试这个

$array_days = ["Mon","Tue","Wed","Thu","Fri"];
for ($i = 0; $i < sizeof($array_days); $i++)
{

//   $weekDay = $array_days[$i];
    for($ii = 0; $ii < 5; $ii++)
    {
    //echo "counter".${$weekDay}.${$ii} = 0;
        $a = "counter".$array_days[$i].$i.$ii;
        $$a = 0;
    }
}

动态PHP变量

7 个答案: