Removing Null items in php array

Question

How can I remove null in the following php array? Can anyone help me pease?

{
    "total": 20,
    "memberships": [
        "channel-568e2ec856e52816891757",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
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        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-568e2ec856e52816891757",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-568e2ec856e52816891757",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-548a652109b5f855658713",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-5695f8e9a0c56329461106",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-540e028357c11975473911",
        "channel-5631e7c4a317d864607733",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-568e2ec856e52816891757",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-5631e7c4a317d864607733",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
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        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-548a652109b5f855658713",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-548a652109b5f855658713",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-548a652109b5f855658713",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
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        null,
        null,
        null,
        null,
        null,
        null,
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        null,
        null,
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        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-568d788e05dcd282842479",
        "channel-568e2ec856e52816891757",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-568e2ec856e52816891757",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-568e2ec856e52816891757",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-5695f8e9a0c56329461106",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "channel-568e2ec856e52816891757",
        "channel-5695f8e9a0c56329461106",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
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        null,
        [
            ""
        ]
    ]
}

array_filter

DarkBee
– DarkBee

2016-02-03 12:33:48 +00:00
Commented Feb 3, 2016 at 12:33 — DarkBee
– DarkBee, Commented Feb 3, 2016 at 12:33

felipsmartins · Accepted Answer · 2016-02-03 12:34:10Z

2

Just use array_filter:

array_filter($array)

array_filter keeps any element evalueted as true in the array. It returns a new array.

answered Feb 3, 2016 at 12:34

felipsmartins

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Comments

DTH · Accepted Answer · 2016-02-03 12:40:03Z

array_filter can remove empty strings, false values and null's from your array:

$entry = array(
             0 => 'foo',
             1 => false,
             2 => -1,
             3 => null,
             4 => ''
          );

print_r(array_filter($entry));

will output:

Array
(
    [0] => foo
    [2] => -1
)

Further more you can define your own filter and call array_filter with a callback function with your desired filtering:

function odd($var)
{
    // returns whether the input integer is odd
    return($var & 1);
}

function even($var)
{
    // returns whether the input integer is even
    return(!($var & 1));
}

$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);

echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";
print_r(array_filter($array2, "even"));

will output:

Odd :
Array
(
    [a] => 1
    [c] => 3
    [e] => 5
)
Even:
Array
(
    [0] => 6
    [2] => 8
    [4] => 10
    [6] => 12
)

Markus Safar · Accepted Answer · 2016-02-03 14:42:03Z

0

You will need to search recrusively and remove each element. Maybe some approach like this one (attention - I have not tested the code and I am NOT a php programmer):

function RemoveNull($array)
{
  foreach ($array as $key => $value)
  {
    if (is_array($value))
    {
      RemoveNull($value);
    }

    if ($value == null)
    {
      unset($array[$key]);
    }
  }
}

edited Feb 3, 2016 at 14:42

answered Feb 3, 2016 at 12:38

Markus Safar

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1 Comment

felipsmartins Over a year ago

Modifying $array does not change the original array as arguments aren't passed in by values. In this case the array ought be either passed by reference or must be "referenced" by global keywordin the function body.

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