Problem defining data variables in smarty

How to define an array in smarty? After referring to smarty's official website documentation, I found that the following method can be used:

定义数组： {assign var=foo value=[1,2,3]} {assign var=foo value=['y'=>'yellow','b'=>'blue']} {assign var=foo value=[1,[9,8],3]} // 可嵌套

Then var_dump, {$foo|var_dump}, and the array can be printed successfully.

However, please note that this syntax does not exist in smarty2. The variable assigned by the above assignment will become a string. Special attention should be paid to this point

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The above introduces the problem of defining data variables in smarty, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.