replace null with blank in array tree recursively php

Question

I want to replace all the null values in array with the blank values or empty string recursively.

Currrently my array is looking like this,which is perfect in structure, i want to replace every null value from it by empty string.

Array
(
    [items] => Array
        (
            [0] => Array
                (
                    [id] => 28
                    [name] => ABC
                    [goal] => 
                    [currency] => 
                    [images] => 
                    [start] => 1446159600
                    [stop] => 1446246000
                )
            [1] => Array
                 (
                    [id] => 29
                    [name] => XYZ
                    [goal] => 
                    [currency] => 
                    [images] => 
                    [start] => 1446159600
                    [stop] => 1446246000
                )
        )
)

Please show me shortest way to replace it.

Where do you see null values? I don't see any, because you are using the wrong debug print function. Try var_dump. — Sven
– Sven, Commented Nov 21, 2015 at 12:01
It is there, showing NULL values when i am using this array for JSON parsing. — Chintan Thummar
– Chintan Thummar, Commented Nov 25, 2015 at 12:41

The fourth bird · Accepted Answer · 2015-11-21 12:21:27Z

8

As pointed out by Rizier123, you can do this with array_walk_recursive

function replaceNullValueWithEmptyString(&$value) {
    $value = $value === null ? "" : $value;
}

array_walk_recursive($array, "replaceNullValueWithEmptyString");

answered Nov 21, 2015 at 12:21

The fourth bird

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Ramalingam Perumal · Accepted Answer · 2015-11-24 07:01:29Z

0

You can get the result array if you using the array_map(); function. Here is example code.

$item = array('a' => 'apple', 'b' => 'banana','c' => 'rama', 'd' => 'lingam','e' => '', 'f' => '');

function addNull($n)
{    
    if($n=='')
        return('NULL');
    else
        return($n);
}

$result_array = array_map("addNull", $item);

print_r($result_array);

edited Nov 24, 2015 at 7:01

answered Nov 21, 2015 at 12:13

Ramalingam Perumal

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