Data table field Demand_praiseid type varchar default empty string How to convert an array

 // 添加点赞人    public function addPraisePeople($uid,$demand_id){        $demandId['demand_id'] = $demand_id;        $m = D('demand');        $praiseid = $m->where($demandId)->getField('demand_praiseid');            }

One of the demands I posted was that nobody saved me. When I like it, I'm going to take out the Demand_praiseid. This field is converted to an array and the UID is stored in the array and the array is stored in the conversion JSON field.

I haven't done it for a day, and I don't know if I'm trying to make this project too complicated.

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 // 添加点赞人    public function addPraisePeople($uid,$demand_id){        $demandId['demand_id'] = $demand_id;        $m = D('demand');        $praiseid = $m->where($demandId)->getField('demand_praiseid');            }

One of the demands I posted was that nobody saved me. When I like it, I'm going to take out the Demand_praiseid. This field is converted to an array and the UID is stored in the array and the array is stored in the conversion JSON field.

I haven't done it for a day, and I don't know if I'm trying to make this project too complicated.

First of all, to understand your problem, you should ask:
The field of a data table is a varchar type, after you get the value of this field in PHP, how do you convert the value of this field to an array?
Second: If you want to convert the contents of Demand_praiseid to an array, this is going to be based on the structure of your demand_praiseid.
PHP has a function of a string-to-array:
Explode (Separator,string,limit)
Parameter Description: separator: Required. Specifies where to split the string.
String: Required. The string to split.
Limit: Optional. Specifies the number of array elements that are returned. Possible values: greater than 0-returns an array containing a maximum of limit elements less than 0-returns an array containing all elements except the last-limit element 0-Returns an array containing an element
I hope I can help you, but I don't seem to understand your needs.

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