How to remove null values in multi-dimensional array? - php

Question

I want to remove null values from this array.
Array(
[0] => Array( [fcmToken] => 123 )
[1] => Array( [fcmToken] => )
[2] => Array( [fcmToken] => 789 )
)
Expected Results
Array(
[0] => Array( [fcmToken] => 123 )
[1] => Array( [fcmToken] => 789 )
)

Answer 1

Here we are using foreach to iterate over values and using $value for non-empty $value["fcmToken"]
$result=array();
foreach($array as $key => $value)
{
if(!empty($value["fcmToken"]))
{
$result[]=$value;
}
}
print_r($result);
Output:
Array
(
[0] => Array
(
[fcmToken] => dfqVhqdqhpk
)
[1] => Array
(
[fcmToken] => dfgdfhqdqhpk
)
)

Answer 2

Use array_filter with a callback:
$r = array_filter($array, function($v) { return !empty($v['fcmToken']); });
For checking exactly null:
$r = array_filter($array, function($v) { return !is_null($v['fcmToken']); });

Answer 3

The best and easy single line solution for filter multidimensional array like below.
$aryMain = array_filter(array_map('array_filter', $aryMain));
I hope this solution is work for you. for more detail please visit below link.
PHP: remove empty array strings in multidimensional array

Answer 4

Danger! Do not trust empty() when dealing with numbers (or number-ish) values that could be zero!!! The same is true with using array_filter without a specific filtering parameter (as several answers on this page are using).
Look at how you can get the wrong output:
Bad Method:
$array = array(
array("fcmToken" => '0'),
array("fcmToken" => 123),
array("fcmToken" => ''),
array("fcmToken" => 789),
array("fcmToken" => 0)
);
$result=array(); // note, this line is unnecessary
foreach($array as $key => $value){ // note, $key is unnecessary
if(!empty($value["fcmToken"])){ // this is not a reliable method
$result[]=$value;
}
}
var_export($result);
Output:
array (
0 =>
array (
'fcmToken' => 123,
),
1 =>
array (
'fcmToken' => 789,
),
)
The zeros got swallowed up!
This is how it should be done:
Instead, you should use strlen() to check the values:
Method #1: foreach()
foreach($array as $sub){
if(strlen($sub["fcmToken"])){
$result[]=$sub;
}
}
var_export($result);
Method #2: array_filter() w/ anonymous function and array_values() for consistency
var_export(array_values(array_filter($array,function($a){return strlen($a['fcmToken']);})));
Output for either method:
array (
0 =>
array (
'fcmToken' => '0',
),
1 =>
array (
'fcmToken' => 123,
),
2 =>
array (
'fcmToken' => 789,
),
3 =>
array (
'fcmToken' => 0,
),
)
Demonstration of bad method and two good methods.

Answer 5

You need to do it using array_map, array_filter and array_values. Check below code :
$entry = array(
array("fcmToken" => 'dfqVhqdqhpk'),
array("fcmToken" => ''),
array("fcmToken" => 'dfgdfhqdqhpk'),
);
echo "<pre>";
$entry = array_values(array_filter(array_map('array_filter', $entry)));
print_r($entry);

Answer 6

Use this recursive function which iterates over any subarray and remove all elements with a null-value.
function removeNullValues ($array) {
foreach ($array as $key => $entry) {
if (is_array($entry)) {
$array[$key] = removeNullValues($entry);
if ($array[$key] === []) {
unset($array[$key]);
}
} else {
if ($entry === null) {
unset($array[$key]);
}
}
}
return $array;
}

Answer 7

Try using array_map() to apply the filter to every array in the array.