PHP - 動態訪問變量

Question

有沒有一種方法可以在PHP中根據另一個因素更改正在更改哪個變量。例如：

$str1 = "The string is 1"; 
$str2 = "The string is 2"; 
$str3 = "The string is 3"; 
$X = 3; 
echo $strX; 

>> "The string is 3." 

編輯：感謝這正是我需要的:)

Answer 1

<?php 
$str1 = "The string is 1"; 
$str2 = "The string is 2"; 
$str3 = "The string is 3"; 
$X = 3; 
echo ${"str".$X}; 
?> 

在這裏閱讀更多Variable variables

Answer 2

我認爲你正在尋找

$str1 = "The string is 1"; 
    $str2 = "The string is 2"; 
    $str3 = "The string is 3"; 
    $X = "str2"; 
    echo ${$X}; 

你也可以使用

$str1 = "The string is 1"; 
    $str2 = "The string is 2"; 
    $str3 = "The string is 3"; 
    $X = "2"; 
    echo ${"str".$X};