How does one filter the response data null through the PHP development interface?

The response data may be a one-dimensional array or a two-dimensional array. How to filter null before json_encode? The response data may be a one-dimensional array or a two-dimensional array. How to filter null before json_encode?

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The response data may be a one-dimensional array or a two-dimensional array. How to filter null before json_encode?

Array_filter can only remove null values of one-dimensional arrays.

function null_filter($arr){    foreach($arr as $key=>&$val) {        if(is_array($val)) {            $val = null_filter($val);        } else {            if($val === null){                unset($arr[$key]);            }        }    }    return $arr;}

There are ready-made functions. By default, all "", null, and false can be filtered out.
If you only need to filter out null, write a callback function similar to the following code.

function delete_null($vo){    if ($vo==null){        return false;    }    return true;}print_r(array_filter(array("aaa","bbb",null,"ccc"),"delete_null"));

Just use array_filter.

Array_filter can only filter a group of arrays, but most of the arrays obtained from the database are two-dimensional. Therefore, you need to write a function yourself and implement it recursively.

The best way is to discuss it with the API developers. Do not return null and return ''better than it,

$data= \str_replace(':null', ':""', json_encode($data));

Speaking of array_filter upstairs, actuallyarray_filter($arr,'strlen')Then, json_encode