PHP Development Interface Response data null how to filter?

The response data may be one-dimensional arrays, or two-dimensional arrays, before json_encode, how to filter null?

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The response data may be one-dimensional arrays, or two-dimensional arrays, before json_encode, how to filter null?

Array_filter is null to remove only 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 that can filter out all ", NULL, FALSE by default
If you only need to filter out null, then 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 array_filter it.

Array_filter actually can only filter a set of arrays, but most of the data obtained from the database is two-dimensional, so this is still to write a function, can be implemented recursively.

The best way is to discuss with the developer of the API, do not return null return ' is also stronger than it,

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

Upstairs talking about Array_filter, in fact, array_filter($arr,'strlen') this filter can be, and then Json_encode

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