PHP回聲變量時，我不知道哪些是要告訴

Question

我有一個日曆做。用戶選擇他/她想要阻止的日子。在數據庫中，將它們保存爲與節日的名稱的數組：

a:3:{i:0;s:6:"easter";i:1;s:12:"thanksgiving";i:2;s:9:"christmas";} 

在文件中，我有每個人的日期字符串：

$thanksgiving = " 
[11, 27, 2014], 
[11, 26, 2015], 
[11, 24, 2016], 
[11, 23, 2017], 
[11, 22, 2018], 
[11, 28, 2019], 
[11, 26, 2020], 
[11, 25, 2021], 
[11, 24, 2022], 
[11, 23, 2023] 
"; 

$christmas = " 
[12, 25, 2014], 
[12, 25, 2015], 
[12, 25, 2016], 
[12, 25, 2017], 
[12, 25, 2018], 
[12, 25, 2019], 
[12, 25, 2020], 
[12, 25, 2021], 
[12, 25, 2022], 
[12, 25, 2023] 
"; 

$fourthofjuly = " 
[07, 04, 2015], 
[07, 04, 2016], 
[07, 04, 2017], 
[07, 04, 2018], 
[07, 04, 2019], 
[07, 04, 2020], 
[07, 04, 2021], 
[07, 04, 2022], 
[07, 04, 2023] 
"; 

等等

$blocked_holidays is the array retrieved from the DB 

When I try to echo it: 
$blocked_string = implode(", $", $blocked_holidays); 
$blocked_string = "[ $" . $blocked_string . " ]"; 

echo $blocked_string; 

I get: [ $newyears, $thanksgiving, $christmas ] 

我怎樣才能得到它回聲的字符串的值？

如果我將其更改爲：

$$thanksgiving = " 
[11, 27, 2014], 
[11, 26, 2015], 
[11, 24, 2016], 
[11, 23, 2017], 
[11, 22, 2018], 
[11, 28, 2019], 
[11, 26, 2020], 
[11, 25, 2021], 
[11, 24, 2022], 
[11, 23, 2023] 
"; 

$$christmas = " 
[12, 25, 2014], 
[12, 25, 2015], 
[12, 25, 2016], 
[12, 25, 2017], 
[12, 25, 2018], 
[12, 25, 2019], 
[12, 25, 2020], 
[12, 25, 2021], 
[12, 25, 2022], 
[12, 25, 2023] 
"; 

$$fourthofjuly = " 
[07, 04, 2015], 
[07, 04, 2016], 
[07, 04, 2017], 
[07, 04, 2018], 
[07, 04, 2019], 
[07, 04, 2020], 
[07, 04, 2021], 
[07, 04, 2022], 
[07, 04, 2023] 
"; 

和

$blocked_string = implode(", $", $$blocked_holidays); 
echo $$blocked_string; 

呼應的日期，但只能從最近的可變的，不是所有的人。

Answer 1

也許這可以幫助你：

$blocked_holidays=array("a", "b", "c"); 
$a=1; $b=2; $c=3; //testing values 

$blocked_string=array(); 
foreach ($blocked_holidays as $value) { 
    array_push($blocked_string, ${$value}); 
} 
echo '['.implode($blocked_string, ',').']'; 

編輯

我覺得我得到你正在嘗試做的事：

$blocked_string=implode(", $", $blocked_holidays); 
$blocked_string=eval('echo "[$'.$blocked_string.']";'); 
echo $blocked_string; 

//or simply 
$blocked_string=eval('echo "[$'.implode(", $", $blocked_holidays).']";');